Doctor Who episode 467: The Sun Makers – Part Two (3/12/1977)
I enjoy how the story is driven by the Doctor and Leela’s attempts to get back to each other, which incidentally start to cause the society of Pluto to begin to unravel. In the Doctor’s case, an attempt to get ransom money for Leela ends up with him captured and incarcerated in the infamous Correction Centre. However, Hade’s conviction that the Doctor is part of a conspiracy means the Doctor is spared from brain surgery, resulting in my favourite scene of the episode: the Doctor and Hade circling round each other as they politely humour each other.