The Third Doctor's defiance against UNIT's institutional control and Brigadier Lethbridge-Stewart's conflicted loyalty to both his duty and the Doctor

The Brigadier makes his move in a tense hangar office, ordering the Doctor's arrest under apparent UNIT authority. This sudden confrontation marks the first violent rupture in the Doctor's relationship …

The Doctor, arrested by UNIT under Finch’s orders, turns the tables by revealing Captain Yates as a traitor secretly working for Grover. The Heavyweight revelation forces Benton to confront his …