The planet Peladon has applied to join the Galactic Federation, and The Doctor is mistaken for the chairman of the committee sent to assess its application, while Jo is taken for an Earth princess, with the mythical curse of Aggedor apparently striking chancellor Torbis dead, The Doctor must discover who is desperate to stop Peladon joining, but soon he is sentenced to death and his only Allies seem to be Jo and the Ice Warrior Delegates.
Jon Pertwee
Katy Manning
David Troughton
Geoffrey Toone
Henry Gilbert
Alan Bennion
Sonny Caldinez
Stuart Fell
Ysanne Churchman
Nick Hobbs
Murphy Grumbar
Terry Bale
Gordon Stothard
George Giles
Wendy Danvers