Season 9

The Time Lords send the Doctor and Jo to the primitive planet of Peladon. King Peladon and his Chancellor wish Peladon to join the Galactic Federation, and are entertaining a delegation from the Federation. The Doctor is mistaken for the Earth delegate, and becomes suspicious when he finds that an Ice Warrior is among the other delegates. Shortly after their arrival, the Chancellor is murdered, apparently by Aggedor - the mythical Royal Beast of Peladon. The Doctor investigates, discovers that there is a conspiracy to prevent Peladon joining the Federation, falls foul of the religious laws of Peladon and has to engage the King's Champion in a duel, and eventually comes face to face with a very real, very hairy and rather large Aggedor. Jo, meanwhile, has her hands full when King Peladon falls in love with her! Can the Doctor stay alive long enough to defeat the conspiracy?