Oliver: Previously on "Arrow"...
You're probably thinking what happened was your fault.
I'm here to tell you that it's not.
It's the fault of only one man, and we're going to stop him.
Do you remember what I promised you?
A new beginning.
And you will have it.
I've seen what he can do with his powers, but when he tried to use them on me, it completely backfired and my bloodlust was gone.
Help me figure out a way to make that permanent.
One day I will have my moment, and I will kill you.
Take that away as well.
The food attracts flies and I prefer my solitude.
The pepper came from the garden.
The garden grows strong even in your absence.
Please try a bite.
Quickly. We must--
[all grunting, swords clanging]
The mountain will be ours by morning.
We must act quickly.
The Usurper will return, and with him, his followers.
Has the Lotus been found?
In Kyushu. It's well guarded.
So was this place upon a time.
Felicity: Good news, the burglar is headed straight towards you.
Bad news, the burglar is headed straight towards you.
Where did he learn to do that?
I'm thinking Cirque Du Soleil.
He's headed for the roof.
Thank you, Black Canary.
That is your cue, Green Arrow and Speedy.
Overusing our code names?
Yep. Indulge her.
We got him, Overwatch.
You have no idea how much I love hearing that.
I think we do, actually.
Two rooftop doors.
Floor plans show that the staircase splits a level below you.
He could come out either door.
♪ Arrow 4x12 ♪
Original Air Date on February 3, 2016
She's ok. She's resting at our place.
She said it was just exhaustion.
We don't believe a word of that, do we?
What else could it be?
The bloodlust makes her feral, it doesn't make her lose consciousness.
And Thea hasn't gone aggro in months.
Exactly. Maybe this is some sort of side effect of her white-knuckling her way through it.
It seems like a bit of a leap.
Ollie, what are you thinking?
That I should have done a better job of keeping an eye on her.
She told me the bloodlust came back two months ago and I didn't even know.
I've been focused on the campaign and I've been running back and forth to Central City and...
How is it that you always manage to blame yourself for everything?
That's his super power. Guilt Arrow.
Did our thief steal anything else from Amertek?
A network mapper.
A piece of tech designed to scan all nearby digital infrastructure for potential vulnerabilities.
Do we think it's his last score?
We better hope that it is.
Amertek's one of the last viable businesses left in Star City.
Turns out Palmer Tech is one of those viable businesses.
For now, at least.
What do you mean for now?
The board, in their infinite wisdom, decided to move the presentation on Curtis' world-changing tech from April to now.
And guess who gets to be the face of that potential disaster?
Oh, well, do you want me to come with you for a little moral support?
Ahh, no, I'll be fine.
It's just a dry run.
In the past 30 years, battery technology has been at a virtual standstill with batteries lasting no longer than they did in the 1970s.
Uh, but with Palmer Tech's power cell, it represents a major breakthrough.
Should have gone with overhead projector.
Could you give us the room, please?
Well, actually, that's gonna be a little difficult, seeing how the entire building's the property of--
[mutters] I'll just-- I'll be right outside.
May I be uncomfortably honest?
Well, you have never shown an inability to do so before.
This company has been flirting with bankruptcy since before you returned to Star City.
And your injury, well, it didn't exactly help our stock price.
We staked the future of Palmer Tech on this power cell.
We need to put our best foot forward.
That is not something that I'm exactly able to do right now.
Sorry, poor choice of words.
What I mean is perhaps it would be better to let someone else do this presentation.
And by "someone else," you mean someone not in a wheelchair.
This is about doing what's best for the company.
Anything less than a perfect launch and we are sunk.
Right. You're right.
Please let the board know.
[Sighs] Just wanted to check in, see how you were doing.
Well, I think the answer to that question is fairly self-evident.
Thea's bloodlust is the balancing of an equation.
She was given life and now she needs to take it.
Malcolm, we know that already.
What we don't know is--
What you don't know, what I didn't know until Thea collapsed is that if the life she owes doesn't come from taking others, it will come from the life of the host.
Please do not refer to me as the host.
This isn't a joke.
If you don't indulge this bloodlust, you will die.
I don't understand.
Sara wasn't like this.
John Constantine made Sara whole and restored the balance.
Thea, I thought you were doing ok.
Because the bloodlust was temporarily blunted.
When we rescued Andy from HIVE, I ran into him.
He tried to kill me with his magic death touch thingie, but it didn't work on me.
What it did do was stop the bloodlust for a time.
We need to find Damien Darhk and make whatever he did to her permanent.
Oliver, even if that were possible, even if you caught Damien in a more cooperative mood, he and his HIVE have gone to ground.
Or haven't you noticed?
Our sticky-fingered friend just pulled another job at Cadmus Tech.
He's two blocks east of you, headed south.
John, I can't right now.
He stole a weapon this time.
Nothing's gonna change here in an hour.
I'm on my way.
Where am I looking?
Diggle: We're working on it.
First Sara, then Ray, then John's brother.
Whose shocking return can we look forward to next?
Oliver, I'm gonna ask this just to ask it.
Are you sure that it was--
It was Roy.
Or maybe it was just somebody who's able to make themselves look like Roy.
Don't act like it's the craziest possibility after everything that we've experienced.
What's crazy is Roy stealing from tech companies.
What did he take this time?
A triode capacitor bomb.
Tiny device, really huge boom.
This is Alex for the 500th time today.
Hey, I was just texting you.
How did you--
Oh, campaign office has a secret elevator.
I came in the side to avoid the media.
Got your 911. Everything all right?
No, not really.
"Ledger's" going to press with it tomorrow, but we got a heads up.
Someone else is throwing their hat in the ring.
Political novice it looks like.
I'm still working up a bio, but she seems to have come out of nowhere to suddenly have a campaign office in Pennytown.
Do you know her from somewhere?
No. I'm just surprised to have an opponent.
[Cell phone rings]
Yeah, it's pretty much a game changer.
Yes, it is.
[Oliver screaming, electricity zapping]
I've never doubted you resiliency, Mr. Queen, but you will tell me.
Why did you need these maps?
He can't tell you anything if you kill him.
Get her out of here.
What did your tattoos reveal, huh?
What were you trying to find?
It's good to see you again.
Are you here to endorse me?
I want a meeting with your husband.
I'm not sure you would survive another meeting with my husband.
No fight this time.
I have a proposition for him.
Tomorrow, 10:30. Kershaw and 8th.
Uh, we have a new problem.
I was going over the schematics of the two pieces of stolen tech, trying to figure out where Roy was going to hit next.
No. I mean, not at first.
A capacitor bomb and a network mapper, that's like a ceiling fan and broccoli.
Sounds like a messy combination.
Combination being the breakthrough.
I stopped trying to figure out what the two pieces of tech had in common and started working on what would happen if they were combined somehow, the components, specifically.
Tell us something good.
Depends on your definition of "good."
But I'm pretty sure that Amertek's network mapper and Cadmus' capacitor could theoretically be used to create a web-nuke.
Like a bomb?
Roy already stole a bomb.
No, I'm talking about a device that can destroy the entire Internet.
We're talking banking systems, nuclear arsenals, power grids.
Last year Roy could barely spell "computer."
Even assuming he did build this device-- why hasn't he used it?
Because it's incomplete. A device like this needs a really substantial power source to run off of.
And guess what company in Star City just invented a next generation revolutionary battery.
[Cell phone buzzes]
I don't want to hurt you.
I don't want you to hurt me, either.
Well, I'm going to need to take that.
Oh, I think you might have to hurt me, then.
There's something wrong with him.
Yeah, I think that's been established.
Let's talk about this, Roy.
Man: I'm in position.
Roy, what are you doing?
Listen very carefully.
Are you sure?
Felicity: Do it.
What did you do?
Take out the tranq, carefully.
Let's hope the Faraday cage Cisco installed in here works.
Basically a shield for everything broadcast and electromagnetic.
Which eye did you see the tech in?
The right one.
How'd you even know he had it?
Roy's eyes are blue.
I'm guessing this was transmitting an AV signal, probably to whoever was picking up the tech.
Well, he can tell us when he wakes up.
Wh--where am I?
We took out the contact.
We made it look like we killed you.
While I'm in here, at least.
New lair. Nice.
I heard about what happened.
Roy, what happened to you.
I got made.
I was in Hub City, new name, new life, everything, and then I got an email.
Steal a bunch of stuff?
Or he'll expose me as Roy Harper.
Suddenly the Arrow's not dead anymore and then the police, they'd be looking at you again.
Who's the blackmailer?
I don't know. I've never met him.
But he calls himself the Calculator.
[Laughs] This is what happens when the bad guys name themselves.
Roy, you should have come to us sooner.
There's a camera built into this.
This is really incredible tech.
He could see every single move I made, every person I talked to.
I couldn't just expose you guys like that.
We would have figured something out.
This is my problem.
'Cause you were solving my problem.
Ok, well, our problem is that the Calculator now has everything he needs to melt the Internet.
I love the Internet.
Which means we have to find him, fast.
Can you backtrace the components, figure out where they're broadcast to?
Girl, you read my mind.
Pop your jacket off, I'll patch you up.
Man, I cannot believe you shot me.
You're having a vision.
The result of your injuries.
You're not real.
But what I've come to tell you is.
What have you come to tell me?
You need to forgive yourself for what you've done.
Unfortunately, you're gonna have to be a little more specific.
You had the chance to leave this island, to return to your family.
They miss you terribly.
I can't go back to my family.
Not the way that I am now.
Then it's time to start changing.
The only way out is through, Oliver.
That's what Amanda Waller said.
Through your own darkness.
Let it go.
I don't know how.
Then I will teach you.
This is it.
I see no shrine.
The woods are the shrine, Talibah.
In times long past, the people of Japan found their Gods in all things.
Nature was their temple.
I must do this alone.
If I do not return within the hour, tell the others the war is over.
You look well.
Being a member of the Crescent Order clearly suits you.
I have found my purpose.
What is yours in Japan?
I've come for the Lotus.
It is my responsibility to keep it safe.
We're evenly matched.
One of us must yield or this will go on for ages.
I have nowhere else to be.
On a matter that concerns Oliver Queen.
I see two options.
We keep fighting until one of us drops from exhaustion or we lay down our swords and you listen to what I have to say.
[Sighs] Maybe next time we can do something that doesn't involve me getting stabbed or shot at.
Just an idea.
I'm sorry that I put you in this position.
I'm pretty sure I put myself in this position.
I remember you not being all that happy that I fakes my death to protect your secret.
I never should have let you.
Do you ever get tired, you know, of carrying the weight of the world on your shoulders like that all the time?
You sound like Felicity.
Well, great minds.
So what are Felicity and John saying you're taking responsibility for now?
[Knock on door]
Oh, my God.
Am I hallucinating?
It's really you.
How are you?
I've been better.
How are you?
Where have you been?
What are you doing here?
How--how long are you--
[Gasping and coughing]
[Gasping and coughing] I don't... I don't know.
Oh, my God.
It's the wound from Ra's.
I'll call 911.
No, doctors can't help her.
Stay with us, Thea. Stay strong.
Give it a minute, it will pass.
How's it going?
This tiny piece of plastic has more computing power in it than most high-end laptops.
I have half a mind to reverse engineer it for Palmer Tech.
Yes, I found a tiny flaw in the OS code.
I'm pretty sure I can exploit it to open a back door to his main computer system.
Right, but wouldn't that risk exposing us?
My pride that you understood what I was saying is slightly uncut by your lack of faith in me.
I've nothing but faith, just do it.
I already did.
Well, well. Whoever you are, let me just say I am very impressed.
No one's ever been able to break through my encryption before.
Disguise your voice.
[Distorted voice] I would take that as a compliment if it wasn't coming from some nutjob who's trying to destroy the Internet.
Why would I want to take down the net?
Not only is it where I work, I'm addicted to funny cat videos.
Well, if you're not trying to take down the Internet, what do you need a web-nuke for?
Very clever keeping me talking to buy you time to breach my firewall.
So that's a pass on telling me your evil plan?
Let's put it this way, if you want to make a statement, you don't take down a system, you take down a city.
Dammit! He shut me out.
Not before indicating what his plan might be.
How do you take down a Ci...
I've been thinking about what would happen if he used the web-nuke to take down the Internet, but if he used it right, overloading the electrical grid, shutting down hospital equipment, causing water main breaks.
He..He could kill everyone in the city.
So a web-nuke needs to be deployed somewhere.
We need to know where the Calculator wants to install it.
I am not calling him that on principle, 'cause it is a lame codename.
Ok, Felicity, but we still have to check--
I'm conducting a review of all the nodes, sub-nodes, and network access points where the web-nuke would do the most damage.
Why do you always ask me that?
If I had any luck looking for what I'm looking for, I would be telling you about it instead of looking for it.
In addition to our lunatic of the week, I have Palmer Tech to look after.
Ray worked up something last year called a battering ram, basically something that could crash through cyber security.
No commercial application, but--
Can you use it to get back into the Calculator's system?
Stop calling him that, I'm serious.
Your darkness is guilt.
You've taken many lives.
The life of your love's brother most recently.
I'm not in love with Taiana.
She helped you recover the maps from the Amazo.
She nursed you back to health.
And all she's received from you in return is a lie.
Open your eyes.
Curtis Holt, have you seen the battering ram?
It's this kick ass piece of tech that ray invented last year.
Um, cyndrical shape, titanium shell.
I'm gearing up for a brute force attack.
Look out for that--
And I need all the firepower I can muster.
Uh, never mind.
Hey, you've gotten pretty slick on that thing in the last 24 hours. What happened?
Yes! I got it.
Thanks, Curtis. You're the best.
I didn't do anything.
You're the one who's whipping around here like a house on fire.
Well, that is what happens when the entire city is at stake.
But now when it's just, say, an entire company.
Mr. Dennis says you're no longer presenting the power cell to the board.
Well, my dry run was an epic disaster.
Yeah, [Laughs] I know.
It was... It was a spectacular failure.
Like, it was really bad.
But it wouldn't have been if this Felicity had come in.
You know, the one who wheels in here kicking ass and taking names like you just did.
This is different.
No, it's not.
There's two Felicitys, Felicity.
The one in that boardroom whose wheelchair makes her doubt herself and this Felicity, a brilliant force of nature.
This company needs the second Felicity.
Laurel told me.
I'm feeling a bit better.
Hey. I'm working on something.
If it's a pedophile for me to kill, Malcolm's already been pitching that one hard.
You're not a killer, Thea.
That's not a way for you to live.
But it sounds like Damien Darhk might be.
Yeah, I'm sure he's just itching to do us a favor.
We're gonna find out.
I arranged a meeting.
It's not like he's gonna be willing to help me.
Maybe there's something that he wants, something I can trade him.
Ollie, that's insane.
Not to mention stupid.
I... I can't let you owe Darhk a favor.
And I can't let you die.
That's not up to you.
Look, I know how you take everything on, everyone's problems.
It's one of the things I love the most about you.
But you can't fix this one, Ollie.
I have to try.
No, you don't.
It's my choice.
It's my life.
She's stubborn, isn't she?
Definitely something she gets from your side of the family.
It doesn't matter.
Because you're going to go hood in hand to Damien Darhk.
I am the Demon's Head. I have my resources.
And I know how to put my ear up against a door.
Leaving the epic stupidity of your plan aside, Thea's right.
This is neither of our decisions.
Malcolm, do you want her to die?
Of course not.
Do you have any idea how badly I want to put a knife in her hand and force her to slit someone's throat?
I've come this close to dragging someone in here for her to kill.
And the reason I don't is because that would be about my feelings and not Thea's.
Oliver, sometimes the greatest act of love is no action at all.
It's her life. It's her choice.
This almost feels like cheating, using Ray's tech to beat this guy.
He's installing the web-nuke at Flint Hill Data Farm.
Yeah, he's doing it right now.
[Cell phone chirps]
Device is onsite.
Hang on a second.
I have seriously missed this.
Overwatch, we're on station.
I'm trying to find the web-nuke, but our adversary knows I'm in his system and he's trying to kick me out.
I did get a look at his protocols, though.
And if the web-nuke goes online, he could kill 8,000 people.
I'd say that's a conservative estimate.
Blowing the gas mains alone would kill 3,000.
Just wait till you see what I've got planned for the subway cars.
Ooh, good story. Write me a letter. From prison.
The battering ram was a neat trick, but the only way you're going to stop me is by removing the web-nuke on site.
And I suspect that you don't come out from behind that keyboard much.
That's what I have friends for.
Ok, so does anyone know how to disconnect this thing?
I brought friends, too.
It's amazing who you can find on the dark web.
Always got to make an entrance, don't you?
Sorry, there was a meeting that I decided not to go to.
Look, I know it's been a while for me, but this still isn't a good thing, right?
You know, I almost feel bad about beating you.
Rarely do I get to meet someone with your talents.
What did you do?
Boom! I believe the technical term is I pwned you.
Be that as it may, I can breach your firewall faster than I can remove the DRMs off a Beatles tune.
Guys, the web-nuke is hard wired in.
Not to get too inside baseball on you, but I need you to blow the thing up.
How much time do we have?
Um, it's a long story, but somewhere between "I Want To Hold Your Hand" and "Hey, Jude."
Priming the explosive.
Something's not working.
He's jamming the detonation frequencies.
Ok, do this the old-fashioned way and manually set the charge.
Yeah, but how do we do that and get out of here in one piece?
Someone has to stay behind.
I'll do it.
Even if you triggered the C4 with an arrow at a distance, you still need to outrun the blast radius.
I can do that.
Just because you're wearing red doesn't make you the Flash, Roy.
I didn't say it wasn't gonna be risky.
You just got a fresh start.
I don't want you to throw it all away.
I'm the one who brought this maniac into your lives.
I need to do this. This is my choice.
It's my life.
See you outside, kid.
Hey, you run like hell.
You guys might want to get out of here.
Come on, Roy.
Just like riding a bicycle.
It's good to have you back, Roy.
You've been missed.
Well, don't get too used to me.
I'm gonna have to go underground again.
Even deeper now that the Calculator knows who I am.
What's to keep him from posting it on the Internet?
Oh, I might have installed a virus in his system that wiped out everything he had on Roy.
I'm sorry I can't stay.
Not just for you guys, but for Thea.
She's gonna be ok, Oliver.
Well, whatever she decides, I'm gonna back her play.
I thought the fever would never break.
I'll get you some water.
I need to tell you something.
Whatever it is, it can wait until you've had some water.
I lied to you.
When I said that Conklin killed your brother, that was a lie.
I don't understand.
I have this darkness inside of me that I've been trying to escape for the longest time.
And I think that I found a way, but first I need to earn your forgiveness.
I didn't know that Vlad was your brother.
There are reasons, but they don't matter, they don't change what I did.
I killed your brother.
I can't believe I let you talk me into this.
You are gonna be great. Break a leg.
This is a day I have looked forward to for a very long time.
Because today I stand (audience laughs) on the shoulders of many giants.
Nikola Tesla, Thomas Edison, Ray Palmer, and of course, Curtis Holt.
Their work has always been about making this world a better place.
And today, we get to take another step towards that goal.
As you know, battery technology has been at a virtual standstill for decades, with batteries lasting, nor charging any faster than they did in the 1970s.
Today Palmer Tech is pleased to introduce the Power Cell, a 100% recyclable battery.
It can charge an electric car for thousands of miles.
And right now, it is single-handedly not only powering this entire presentation, but this entire building.
She is something else, isn't she?
You have no idea.
You know, you should be a nurse in your new life.
You're a natural at it.
The only problem is, I am a one-patient man, and I'm already committed to you.
Is that why you're leaving?
Look, I get it, Star City is filled with too many people who can recognize you.
You know, I thought about staying anyway.
You know what you could do for me?
Go live an amazing life.
Get married, have a couple of kids.
Get a minivan.
Just go be normal.
There's nothing in this world that would make me happier than that.
You know, if I could do all of this over again, I would do every single one of those things with you.
I love you, Thea Queen.
I love you, Roy Harper.
You were amazing out there.
How's Thea doing?
I'm gonna go check on her now.
I'm just gonna debrief with Curtis, but text me how she's doing.
Oh, my God.
How is she?
Where's your new BFF Damien?
I don't know.
Like you said, this is Thea's decision, it's not mine.
Oliver, I know it feels wrong, but you did the right thing.
However it feels, I couldn't have done it without you.
Malcolm, thank you.
Oliver, it's Thea.
How long will she be in a coma?
Right now she's barely a 3 on the Glasgow Scale.
Prognosis isn't good.
Thea, please don't go.
There's only one way to prevent that.
My father once told me of an elixir known as Lotus, capable of countering the effects of the Lazarus Pit.
A secret weapon developed by the League's enemies.
Do you have it?
And I will freely give it to you on one condition.
I want you to kill Malcolm Merlyn.