BY: LOUIS MARKS
Part Four
Original Air Date: 18 October 1975
Running time: 23:43
REIG: Maintain boosters at full thrust. We're only just holding rev. We must avoid being pulled into reverse.
REIG: This is the command deck! Send help! Argh!
REIG (OOV.): Help! Argh!
SALAMAR: Reig!
VISHINSKY: Reig. If we hadn't been wasting our time down there.
SALAMAR: They caused it all.
VISHINSKY: How could they have caused this? We were with them. (into intercom) Attention. All crewmen report to assembly point immediately. Red alert! Red alert!
SALAMAR: Countermanded. Only I can give a red alert.
VISHINSKY: It's too late for any more mistakes, Salamar. I'm taking command.
SALAMAR: You'll regret this.
DOCTOR: Where've they gone?
SARAH: I think there's been another k*lling.
DOCTOR: What?
SARAH: Doctor. Doctor, it is that thing from the planet. I felt it.
DOCTOR: You what?
SARAH: Just before de Haan was k*lled, I felt the same sort of icy suction.
DOCTOR: Who was with you?
SARAH: Professor Sorenson.
DOCTOR: Sorenson. Of course. The sole survivor of the expedition.
SARAH: So Sorenson is Antiman.
DOCTOR: Yes. He's been infected with antimatter. His brain cells are being destroyed. He'll descend to the level of a brute. Sarah?
SARAH: Yes?
DOCTOR: Get to command deck. Tell them to shut down all the hatches. Our only chance is to keep it isolated.
SARAH: Right. But what are you going to do? Doctor!
DOCTOR: Do as I say.
VISHINSKY: Command area to solarium section. Who's in charge there?
RANJIT (OOV.): Senior crewleader Ranjit, sir.
VISHINSKY: Ranjit? Good. You know why we're on red alert?
RANJIT (OOV.): They say we picked up some contagion back on the planet.
VISHINSKY: We picked up something. Some animal. It's k*lled Morelli, Reig and de Haan, so take no chances. Keep your men on full alert and await further orders.
RANJIT (OOV.): Right, sir.
SALAMAR: What are you going to do now, Vishinsky? Look at the course monitor. We're heading back to Zeta Minor. Come on, you've taken charge. Give an order. Give an order that'll stop us crashing, or we're all going to die.
VISHINSKY: Keep your nerve, Salamar.
VISHINSKY: Where's the Doctor?
SARAH: I don't know, but he said you've got to close all the hatchways immediately.
VISHINSKY: As soon as Professor Sorenson reports in.
SARAH: No, now! Don't wait for Sorenson. The Doctor says he's behind all this.
SALAMAR: That's insane. How can he be?
SARAH: Something on the planet affected him. Look, you've got to shut the hatchways before it's too late.
SALAMAR: It's another trick.
VISHINSKY: The Doctor's been right so far. We should have listened to him before. Close all section hatchways!
DOCTOR: Keep away!
SARAH: And the antimatter has turned Sorenson into that monster.
VISHINSKY: It's incredible. Sorenson?
VISHINSKY: Salamar!
SALAMAR: Keep away!
VISHINSKY: Don't be a fool.
DOCTOR: Keep away.
SORENSON: I require an explanation.
DOCTOR: Professor Sorenson, you're ill.
SORENSON: What do you mean, ill?
DOCTOR: You think you've discovered an oral vaccine to protect you against antiquark penetration, but you're wrong.
SORENSON: It worked.
DOCTOR: For a time, but it set up a cycle of chemical change. There's no way back, Sorenson. You've reached the point where your tissues are so monstrously hybridised that the next metabolic change could be the final one.
SORENSON: No.
DOCTOR: There isn't much time.
SORENSON: No!
DOCTOR: You and I are scientists, Professor. We buy our privilege to experiment at the cost of total responsibility.
SORENSON: The hypothesis was false.
SALAMAR: Open the hatch!
VISHINSKY: Take the shielding off that neutron accelerator, you'll be dead in minutes.
SALAMAR: But I'll take Sorenson with me. You'd like that, wouldn't you, Vishinsky? That might save your life. You'd like to live?
VISHINSKY: You're out of your mind.
SALAMAR: Oh, no. No, this is leadership. Strong action. That's why I'm Controller. Open that hatch!
SALAMAR: Now, open it!
SARAH: Let him go, Vishinsky. Let him go!
SALAMAR: You, Controller? You haven't a hope.
VISHINSKY: If Sorenson doesn't get him, the radiation will.
VISHINSKY [OC}: Command area calling.
DOCTOR (OOV.): This is the Doctor.
VISHINSKY: Doctor, we're accelerating back to Zeta Minor. Have you located the antimatter?
DOCTOR: Listen, Vishinsky. Listen. There are now two forces of antimatter aboard. I've got one, and the other one is Sorenson himself.
SARAH: But Salamar's out hunting Sorenson now.
VISHINSKY: With a neutron accelerator.
DOCTOR: He's got to be stopped. How long to impact?
VISHINSKY (OOV.): Less than thirty minutes.
DOCTOR: Keep the hatchways open.
SALAMAR: Come on! Come on out and face me!
DOCTOR (OOV.): Salamar!
DOCTOR: Where are you, Salamar? Don't use the accelerator. Salamar!
DOCTOR (OOV.): Where are you? Salamar! Whatever you do, don't use the accelerator!
DOCTOR (OOV.): Salamar!
VISHINSKY (OOV.): Command area.
DOCTOR: Vishinsky, it's too late. Salamar's dead.
DOCTOR (OOV.): He used the neutron accelerator. If he hit Sorenson, it could be disastrous.
SARAH: You mean things can get worse? I don't believe it.
DOCTOR (OOV.): Keep the hatches open. I'm coming up.
SARAH: Oh, why is he taking so long?
VISHINSKY: I'll try the quarantine area again. Doctor. Doctor, if you can hear me, indicate your position.
SARAH: Something's happened to him. Doctor, are you all right?
DOCTOR (OOV.): Open up, Vishinsky. Open up!
DOCTOR: Shut down all the hatchways. It may hold them.
SARAH: Them?
DOCTOR: Yes, them. They've multiplied.
SARAH: Doctor, look. The hatchways are going.
VISHINSKY: What are they?
DOCTOR: Duplicates of Sorenson. Pure antimatter. The neutron accelerator boosted its power, and the creatures split off and multiplied.
VISHINSKY: They're going towards the solarium chamber. Ranjit, what's happening? Can you hear me?
RANJIT (OOV.): They're attacking. We need help! They're coming through! Argh!
VISHINSKY: Seven men. Sixteen minutes to impact.
SARAH: How can we stop them?
VISHINSKY: Acceleration thirty STS. Fifteen minutes.
SARAH: Doctor, what are we going to do?
DOCTOR: Stay here with Vishinsky, Sarah. I'm going out now and I may be some time.
VISHINSKY: Acceleration fifty STS. Fourteen minutes.
DOCTOR: Sorenson? Sorenson.
VISHINSKY: Acceleration seventy three STS. Eight minutes.
VISHINSKY: They're all around us. Come on, I'll need your help.
SARAH: We've only six minutes. Where are we going?
VISHINSKY: To get the forcefield equipment. If we can lay a band around the command area we may be able to keep them out.
VISHINSKY: Take that. I'll bring the control box.
VISHINSKY: Back, quickly!
VISHINSKY: Direction them in a line straight across. We'll seal off the area.
SARAH: Look!
VISHINSKY: Thirty seconds. Look, we're slowing down. Twenty five seconds. We've stopped. We're still on full power.
SARAH: We're moving again.
VISHINSKY: We're gaining height! We're moving away from the surface! The Doctor has done it!
SARAH: Yes, but where is he?
DOCTOR: Sorenson. Professor Sorenson.
SORENSON: Where am I? What am I doing here?
DOCTOR: You're a very lucky man, Professor. You've been released.
SORENSON: Released?
DOCTOR: Yes. Because I kept my promise and returned the antimatter.
SORENSON: This isn't the Morestran probe ship.
DOCTOR: Don't you worry, Professor. Just rest a while. Everything's going to be all right.
VISHINSKY: We're making good progress now. Once we cross the galactic frontier we can signal for an emergency refuelling.
SARAH: Doctor!
VISHINSKY: Professor Sorenson! Are you all right?
SORENSON: Yes. Yes, I remember now. My researches. I've discovered a new source of energy.
DOCTOR: No, no, no, Professor. I think you'd abandoned that line. You'd decided to concentrate on deriving energy from the kinetic force of planetary movement.
SORENSON: Had I?
DOCTOR: Yes. Large source of untapped energy there.
SORENSON: The kinetic force of planetary movement. What a brilliant idea!
SARAH: Goodbye, Vishinsky. And thank you.
VISHINSKY: Goodbye. Goodbye, Doctor.
DOCTOR: Goodbye, Vishinsky. Come on, Sarah. We've an appointment in London and we're already thirty thousand years late.
`
The Doctor
Tom Baker
Sarah Jane Smith
Elisabeth Sladen
Vishinsky
Ewen Solon
Sorenson
Frederick Jaeger
Salamar
Prentis Hancock
Morelli
Michael Wisher
De Haan
Graham Weston
Ponti
Louis Mahoney
Braun
Terence Brook
Baldwin
Tony McEwan
O'Hara
Haydn Wood
Reig
Melvyn Bedford
Writer
Louis Marks
Director
David Maloney
Designer
Roger Murray-Leach
Producer
Philip Hinchcliffe
Script Editor
Robert Holmes
Assistant Floor Manager
Karilyn Collier
Costumes
Andrew Rose
Film Cameraman
Stan Speel, Kenneth McMillan
Film Editor
M A C Adams
Incidental Music
Dudley Simpson
Make-Up
Jenny Shircore
Production Assistant
Malachy Shaw Jones
Production Unit Manager
Janet Radenkovic
Special Sounds
Peter Howell
Studio Lighting
Brian Clemett
Studio Sound
Tony Millier, Brendan Shaw
Theme Arrangement
Delia Derbyshire
Title Music
Ron Grainer
Visual Effects
Dave Havard
Tom Baker
Sarah Jane Smith
Elisabeth Sladen
Vishinsky
Ewen Solon
Sorenson
Frederick Jaeger
Salamar
Prentis Hancock
Morelli
Michael Wisher
De Haan
Graham Weston
Ponti
Louis Mahoney
Braun
Terence Brook
Baldwin
Tony McEwan
O'Hara
Haydn Wood
Reig
Melvyn Bedford
Writer
Louis Marks
Director
David Maloney
Designer
Roger Murray-Leach
Producer
Philip Hinchcliffe
Script Editor
Robert Holmes
Assistant Floor Manager
Karilyn Collier
Costumes
Andrew Rose
Film Cameraman
Stan Speel, Kenneth McMillan
Film Editor
M A C Adams
Incidental Music
Dudley Simpson
Make-Up
Jenny Shircore
Production Assistant
Malachy Shaw Jones
Production Unit Manager
Janet Radenkovic
Special Sounds
Peter Howell
Studio Lighting
Brian Clemett
Studio Sound
Tony Millier, Brendan Shaw
Theme Arrangement
Delia Derbyshire
Title Music
Ron Grainer
Visual Effects
Dave Havard