Sapphire & Steel

Sapphire and Steel receive a puzzling assignment at an apartment complex where time is poised to attack.

Rothwyn and Eldred, the couple living inside the space capsule, begin to realize they might be in serious danger when they cannot make contact with fellow study groups or with their superiors.

After Sapphire disappears while trying to contact the creature inside the capsule, Steel must figure out where she has gone and how to proceed with the investigation.

Sapphire and Steel subdue the changeling and find where the time source is hiding in the wall.

After Silver's return, the three time agents question the couple from the future about their origins and their knowledge about the machine that transported them through time.