Avedon is an island where apes and talking humans live in equality but in the style of medieval times. Ruled by King Arthur, the community includes Sir Gawain, Lady Andréa and Robin Hood. When time traveller Derek Zane is found on the shore of the island by Gawain, he is taken to Arthur's castle. Gawain loses a duel with Derek and is expelled from Avedon, which is also attacked by the pursuing General Gorodon. Andréa eventually marries Derek but he then decides to return to the mainland with Hood to look for the missing Col. Taylor and his crew.