TEXT: 5:15pm - 5:40pm [SCENE_BREAK] 1: INT. EXHIBITION VAULT (A man wearing a black uniform lies still at the foot of several glass cases. IAN, who is alone, crouches down by him. He looks in the nearest case and, seeing something inside, desperately attempts to open it. The black gloved hand of an unseen assailant brings a club down on his head and he collapses. The figure places the club in IAN'S hand before moving to the case. By opening a side panel it removes the object which is none other than the final key. An alarm bell sounds. IAN lies on the floor, unconscious.) [SCENE_BREAK] 2: INT. EXHIBITION VAULT (LATER) (IAN comes to and rises, groaning and rubbing his head. The alarm has stopped now. He goes over to the cabinet only to find that the key is gone.) TARRON: Do you want to tell me where you've hidden it? (IAN whirls around to see that a dark-haired youngish man, wearing a similar black uniform to the man who was on the floor, is seated on the far side of the room in front of a series of display cabinets containing regalia and other ornaments.) IAN: Who are you? TARRON: My name is Tarron. I'm an interrogator in the guardian division. Do you feel well enough to talk? IAN: (Rubbing his neck and head.) Well my head's pretty sore. What happened here? TARRON: I'm waiting for you to tell me. IAN: Me? I don't know much. I just came through that door. TARRON: It was unlocked? IAN: It... was ajar. I saw the body on the floor, bent down to have a look and... someone hit me on the head from behind. (TARRON stands up.) TARRON: You could not've come through that door unless the guard on duty in here let you in. IAN: It was open, I've already told you. TAR
SUMMARY:
The TARDIS arrives on the planet Marinus on an island of glass surrounded by a sea of acid. The travellers are forced by the elderly Arbitan to retrieve four of the five operating keys to a machine called the Conscience of Marinus, of which he is the keeper. These have been hidden in different locations around the planet to prevent them falling into the hands of the evil Yartek and his Voord warriors, who plan to seize the machine and use its originally benevolent mind-influencing power for their own sinister purposes.