The Doctor returns to Gallifrey, claims his rights and is inaugurated President. It soon turns out that he has led a group of aliens called Vardans to the planet to eradicate them completely. After they are destroyed, the Sontarans take their opportunity and follow them in their invasion until they are destroyed by the Doctor.
Tom Baker
as The Doctor
Louise Jameson
as Leela
Chris Tranchell
as Andred
Milton Johns
as Castellan Kelner
Dennis Edwards
as Lord Gomer
Reginald Jessup
as Lord Savar
Charles Morgan
as Gold Usher
John Leeson
as K9 (voice)
Derek Deadman
as Stor
John Arnatt
as Chancellor Borusa
