Peter Cushing as Doctor Who

Roy Castle as Ian Chesterton

Jennie Linden as Barbara

Roberta Tovey as Susan

Barrie Ingham as Alydon

Michael Coles as Ganatus

Geoffrey Toone as Temmosus

Yvonne Antrobus as Dyoni

John Bown as Antodus

Mark Peterson as Elyon

Ken Garady as Thal

Nicholas Head as Thal

Mike Lennox as Thal

Jack Waters as Thal

Virginia Tyler as Thal

Jane Lumb as Thal

Bruce Wells as Thal

Martin Grace as Thal

Sharon Young as Thal

Gary Wyler as Thal

Mike Reid as Thal (uncredited)

Michelle Scott as Thal Child (uncredited)

Bruno Castagnoli as Dalek Operator

Mick Dillon as Dalek Operator

Bryan Hands as Dalek Operator

Robert Jewell as Dalek Operator

Kevin Manser as Dalek Operator

Eric McKay as Dalek Operator

Len Sanders as Dalek Operator

Gerald Taylor as Dalek Operator

David Graham as Dalek Voices (uncredited)

Peter Hawkins as Dalek Voices (uncredited)