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.
Writer: Simon Gurrier
Director: John Ainsworth
Companions: Jamie McCrimmon (Frazer Hines, narrator), Zoe Heriot
Summary: The TARDIS makes an emergency landing on a world orbiting a pulsar that can warp time. The Doctor, Jamie, and Zoe discover scientists studying an ancient city. It appears to be abandoned, but in reality, beings called the Quiet Ones have detected their presence. But help comes from an unexpected source.