#11 The Deadly Assassin
A four-part story titled “The Deadly Assassin” aired during Tom Baker’s third season as the Doctor. Criticism of the story was sparked by the “graphic violence” shown in the episodes. The story was infamous for being the most obscene thing ever shown on “teatime TV,” what with the Doctor shooting another Time Lord and a rotting skeleton.
On top of all that, the episode ends on a cliffhanger in which the Doctor is shown almost drowning before the credits roll. This scene was so controversial that the BBC issued an apology and removed it from reruns. It was a tale that went beyond the bounds of what was considered suitable for broadcast at the time.