Primitive aliens with no concept of technology or judicial proceedings want to join a galactic federation in this allegory of Britain’s entry into the EEC
Having sort of repaired the TARDIS, The Third Doctor and his companion, Jo Grant, embark on a journey to the planet of Peladon in the year 3885. There, King Peladon is just about to join the European Union, aka The Galactic Federation, and is meeting with delegates from all around the cosmos — specifically a pair of Ice Warriors and representatives from Arcturus and Alpha Centauri.
Posing as the delegates from Earth, Doc and Jo join the diplomatic talks when suddenly the legendary curse of Peladon seems to become a reality. A horned beast is attacking members of the court and threatening the delegates, thus throwing Peladon’s admission into the Galactic Federation into jeopardy.