William Hartnell as The Doctor

Maureen O'Brien as Vicki

Peter Purves as Steven Taylor

Peter Butterworth as The Monk

Alethea Charlton as Edith

Peter Russell as Eldred

Michael Miller as Wulnoth

Michael Guest as Saxon Hunter

Norman Hartley as Ulf

Geoffrey Cheshire as Viking Leader

David Anderson as Sven

Ronald Rich as Gunnar the Giant