The Sontaran-led invasion force, coordinated by Chessene and Stike, against the Space Station Chimera's Time Lord-aligned research, aiming to seize temporal control and expand Sontaran military presence.

The bridge crew identifies three approaching Sontaran battle cruisers on defensive screens as Doctor and Peri materialize beside a falsified lake. Before any action can be taken, Chessene secretly disables …

The station’s environmental systems turn hostile against Peri and the Doctor after their materialization, flooding the corridor with bloodstained detritus and signs of a brutal struggle. The computer declares the …