Peter Davison as The Doctor

Janet Fielding as Tegan Jovanka

Mark Strickson as Vislor Turlough

Tom Adams as Vorshak

Ian McCulloch as Nilson

Ingrid Pitt as Solow

Nigel Humphreys as Bulic

Tara Ward as Preston

Martin Neil as Maddox

Nitza Shaul as Karina

James Coombes as Paroli

Norman Comer as Icthar

Stuart Blake as Scibus

Vincent Brimble as Tarpok

Christopher Farries as Sauvix

Tai Ling as Seabase Crewmember