The Doctor and companions' struggle to survive and escape Sentinel Six's automated defenses while uncovering the base's true nature

The Doctor attempts to deflect Sentinel Six by offering vague deferential explanations of their presence while quietly planning escape maneuvers inside the TARDIS. Realizing the AI has detected their unauthorized …

The Doctor navigates the TARDIS through orbit as Sentinel Six detects the ship’s presence and issues hostile warnings. Despite claiming to be unarmed, the Doctor’s pleas for time are ignored …

The Doctor's attempt to evade Sentinel Six's destructive pursuit triggers an emergency realization as the TARDIS violently materializes inside Sea Base Four's compound. The sudden intrusion startles companions Turlough and …