Jon Pertwee as The Doctor

Tom Baker as The Doctor

Elisabeth Sladen as Sarah Jane Smith

Nicholas Courtney as Brigadier Lethbridge-Stewart

Richard Franklin as Mike Yates

John Levene as Sergeant Benton

John Dearth as Lupton

Carl Forgione as Land

Andrew Staines as Keaver

Terence Lodge as Moss

Christopher Burgess as Barnes

John Kane as Tommy

Kevin Lindsay as Cho-Je

George Cormack as K'anpo

Cyril Shaps as Professor Clegg

Chubby Oates as Policeman

Pat Gorman as Soldier

Terry Walsh as Man with Boat

Michael Pinder as Hopkins

Stuart Fell as Tramp

Geoffrey Morris as Sabor

Ralph Arliss as Tuar

Gareth Hunt as Arak

Jenny Laird as Neska

Joanna Monro as Rega

Walter Randall as Guard Captain

Max Faulkner as Guard Captain

Ysanne Churchman as Spider Voice

Kismet Delgado as Spider Voice

Maureen Morris as Spider Voice