The Fourth Doctor's strategic contest with High Lord Borusa over the manipulation and control of the Great Key, involving psychological maneuvering, trust violations, and institutional power struggles

Borusa reveals a hidden surveillance device while testing the Doctor’s intentions. He observes the Doctor from a concealed chamber, noting the Time Lord’s claims of assistance. Borusa then voices skepticism …

Borusa and the Doctor modify their escape plan as artillery pounds the President's Office door. Borusa agrees to the Doctor's TARDIS route but the Doctor uses the distraction to demand …

The Doctor swiftly reassigns roles to his allies as Sontaran pressure mounts, entrusting Leela with the Great Key to safeguard while directing Borusa to a restricted suite. Turning to Rodan, …