The Doctor and his companions Steven Taylor and Dodo Chaplet arrive some ten million years into the future, on board a generation starship which is carrying the last of humanity away from an Earth that is about to fall into the Sun. However, the cold that Dodo has could prove devastating to these future humans and their servants, the Monoids.
William Hartnell
as The Doctor
Peter Purves
as Steven Taylor
Jackie Lane
as Dodo Chaplet
Eric Elliott
as Commander
Inigo Jackson
as Zentos
Roy Spencer
as Manyak
Michael Sheard
as Rhos
Kate Newman
as Mellium
Ian Frost
as Baccu
Stephanie Heesom
as Guardian
Paul Greenhalgh
as Guardian
Edmund Coulter
as Monoid
