Sapphire & Steel - Season 3 - Eps 1: Assignment III: The Creatures' Revenge (1)
Sapphire and Steel receive a puzzling assignment at an apartment complex where time is poised to attack. However, their inspection of every room in the complex reveals nothing suspicious. Even the abandoned top floor reveals no indications of trouble. It is only after investigating the roof that Sapphire and Steel discover an invisible time-capsule from 1500 years in the future. A couple and their new baby are living inside the capsule as an experiment, but they are in grave danger because of a horrible figure hidden inside the capsule with them.
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