One way or another, three of the four Doctors trapped in the Death Zone on Gallifrey have made it into the Tower. Dr 3 and Sarah Jane are heading down from the top, while Dr 2 with the Brigadier, and Dr 1 and Tegan go upstairs. The chamber containing the tomb of that legendary Time Lord Rassilon must be somewhere between.
As they go along with their respective Doctors, Sarah Jane and Tegan each express a dreadful feeling of foreboding, as if they’re walking into disaster. Dr 3 tells Sarah that he feels it too; it’s the Mind of Rassilon reaching out to them as they get nearer to his tomb.
To demonstrate Rassilon’s powers, even though he’s been dead for quite some time, the Doctors run into a few minor obstacles. This is also the show’s opportunity to get in a few more old companions who were available.
Dr 3 runs into Liz Shaw and Mike Yeats, formerly of UNIT. In answer to his question, they assure him that “the little fellow with the checked trousers” as well as his other selves are just ahead, waiting for him. They need his help. He believes them at first, but when he tries to go back to get Sarah Jane, whom he left sitting on the last stairway down, before going on with Mike and Liz, they try to stop him. Dr 3 then realizes that they’re only illusions and runs back down the corridor the way he came.
Fake Liz screams “stooopp hiiim” in a creepy echoing voice before both she and Fake Mike disappear.
Dr 3 now has his doubts about Sarah Jane too for a moment, but aside from being a bit more cranky than usual since she rolled down that ridiculously undangerous hill, she’s been perfectly normal. They head down another corridor.
When Tegan expresses her feelings of dread and danger, Dr 1 pooh-poohs it and tells her he doesn’t feel any such thing. It’s all illusion. Just ignore it. And he marches on, unperturbed. Tegan shudders but follows.
Unnoticed by them, the Master is sneaking up the stairs behind them.