William Hartnell

The Doctor

Jacqueline Hill

Barbara Wright

William Russell

Ian Chesterton

Maureen O'Brien

Vicki

Ray Barrett

Bennett / Koquillion

Tom Sheridan

Space Captain (voice)

John Stuart

Didonian (uncredited)

Colin Hughes

Didonian (uncredited)

Daphne Dare

Costume Design

Sonia Markham

Makeup Artist

Raymond Cusick

Production Design

Christopher Barry

Director

David Whitaker

Writer

Dennis Spooner

Script Editor

Verity Lambert

Producer

Mervyn Pinfield

Associate Producer

Tristram Cary

Original Music Composer

Delia Derbyshire

Theme Song Performance