Writer: Brian Hayles
Director: Derek Martinus
Producer: Innes Lloyd
Companions: Victoria Wakefield (Deborah Watling), Jamie McCrimmon (Frazer Hines)
Season: 5, ep. 3 (11-16)
No. of Episodes: 6 (parts 2-3 are animated)
Summary: The Doctor, Jamie, and Victoria arrive on a base in the Arctic run by a giant computer. One of the scientists has discovered two frozen warriors from the planet Mars.