TEXT: THE INVISIBLE ENEMY BY BOB BAKER AND DAVE MARTIN Part Four Running time: 21:22 [SCENE_BREAK] NUCLEUS: Help me out. DOCTOR: Professor Marius. The Doctor sees Marius' scaly face. DOCTOR: Oh no, not you too. MARIUS: Yes, Doctor. Contact has been made. Now I serve the purpose. DOCTOR: What? That pathetic crustacean, your leader? MARIUS: You are speaking of the Nucleus, the Nucleus of the Swarm. NUCLEUS: Take me to him. DOCTOR: Finding the macro world difficult? NUCLEUS: It suits me well. DOCTOR: I thought I'd got rid of you. NUCLEUS: You were mistaken. I made use of your escape route through the eye. DOCTOR: Yes, you'd have known about that, wouldn't you. NUCLEUS: Another mistake, and a costly one, Time Lord, because now, thanks to your dimensional stabiliser, I am no longer forced to exist in the micro world to breed and multiply. My Swarm, when it is hatched on Titan, will no longer be invisible microbes prey to all, but mighty and invulnerable creatures, invincible. The age of man is over, Doctor. The age of the virus has begun. DOCTOR: I've heard it all before. You megalomaniacs are all the same. NUCLEUS: Bring him with us to Titan, to be consumed by the Swarm. [SCENE_BREAK] In another room Leela has dressed in the green PVC nurses outfit and puts makeup on her face to look as if she's possessed by the virus. LEELA: How do I look? K9: Friend, mistress. LEELA: If I can just get close enough to that Nucleus, we'll see how friendly I am. K9: Hostiles approaching with the Doctor. Out in the corridor the infected people are moving the nucleus and the Doctor toward the airlock. LEELA: Come on. NUCLEUS: Hurry, hurry. It is time for the spawning. I
SUMMARY:
In trying to retrieve the clones from inside the Doctor, the alien virus is brought from the microbial world into the macro-world, and it's ready to spawn.