

18/01/1969
The TARDIS arrives on the unnamed planet of the Gonds, who are ruled and taught in a form of self-perpetuating slavery by the alien Krotons — crystalline beings whose ship, the Dynatrope, crash-landed there thousands of years earlier after being damaged in a space battle. The Krotons are in suspended animation, in a crystalline slurry form, awaiting a time when they can be reconstituted by absorption of mental energy. Periodically, the two most brilliant Gond students are received into the Dynatrope, nominally to become "companions of the Krotons", but in truth to have their mental energy drained, after which they are killed.

Patrick Troughton
as The Doctor

Frazer Hines
as Jamie McCrimmon

Wendy Padbury
as Zoe Heriot

James Copeland
as Selris

James Cairncross
as Beta

Gilbert Wynne
as Thara

Philip Madoc
as Eelek

Terence Brown
as Abu

Madeleine Mills
as Vana

Richard Ireson
as Axus

Maurice Selwyn
as Custodian

Bronson Shaw
as Student

Roy Skelton
as Kroton Voice

Patrick Tull
as Kroton Voice

Robert La'Bassiere
as Kroton

Miles Northover
as Kroton
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