Jon Pertwee

The Doctor

Caroline John

Liz Shaw

Nicholas Courtney

Brigadier Lethbridge-Stewart

Fulton Mackay

Dr. Quinn

Norman Jones

Major Baker

Peter Miles

Dr. Lawrence

Thomasine Heiner

Miss Dawson

John Newman

Spencer

Geoffrey Palmer

Masters

Ian Cunningham

Dr. Meredith

Paul Darrow

Captain Hawkins

Roy Branigan

Roberts

Bill Matthews

Davis

Nancie Jackson

Doris Squire

Gordon Richardson

Squire

Pat Gorman

Silurian

Paul Barton

Silurian

Simon Cain

Silurian

John Churchill

Silurian

Dave Carter

Silurian

Peter Halliday

Silurian (voices)