Sapphire & Steel - Season 1 - Eps 4: Assignment I: Escape through a Crack in Time (4)
Steel's drastic measures to save Sapphire and trap the pool of light prove effective, if extremely dangerous. Sapphire places the pool of light in a freezer to keep it from escaping again and tends to Steel's recovery. She also enlists Rob and Helen's help in removing all the objects in the house that could become hiding places for other pools of light. Sapphire and Steel welcome the arrival of fellow agent Lead, a gentle giant with a huge personality to match his huge stature.
About Sapphire & Steel

Title: Sapphire & Steel
First Air Date: 1979-07-10
Last Air Date: 1982-08-31
Status: Ended
Rating: 7.4/10 (from 23 votes)
Language: EN
Seasons: 7
Total Episodes: 34
Network: ITV1
Genres: Drama, Sci-Fi & Fantasy
Production Companies: Unknown
Synopsis
Sapphire & Steel is a British television science-fiction fantasy series starring David McCallum as Steel and Joanna Lumley as Sapphire. Produced by ATV, it ran from 1979 to 1982 on the ITV network. The series was created by Peter J. Hammond who conceived the programme under the working title The Time Menders, after a stay in an allegedly haunted castle. Hammond also wrote all the stories except for the fifth, which was co-written by Don Houghton and Anthony Read. In 2004, Sapphire and Steel returned in a series of audio dramas starring David Warner and Susannah Harker.
Cast

David McCallum
Steel

Joanna Lumley
Sapphire