The TARDIS materialises in an underground cave during an earthquake. The Doctor and Jo escape the TARDIS just in time as it falls into a crevice. They are surprised to see the TARDIS reappear and fall again, and the Doctor realises it's caught in a time loop. The Doctor is appalled at Katsoudas' actions and worried when the lift brings back only Spiridakis. He wishes to meet Senator Szef, who now appears on the scene. The Doctor realises he should have expected that Szef was in fact the Master. He is accompanied by Jo, whom he has captured.