Sapphire & Steel - Season 2 (1981)

Once Silver concocts a way inside the capsule, he transports Sapphire and Steel into the experimental pod from the future. The couple are no where to be found but Sapphire, Steel, and Silver come face-to-face with the adult-sized infant. Sapphire deciphers that the overgrown baby is a changeling controlled by time. The changeling senses that the three time agents are a threat and the force controlling the changeling commands that he destroy them.

Sapphire and Steel subdue the changeling and find where the time source is hiding in the wall. Without their technician, however, they have no way to deconstruct the wall and defeat the creature hidden inside. Steel's decision to resort to drastic measures pays off when the couple reappear in the capsule and the changeling becomes an infant again. But the creature inside the wall still thrives and presents a larger threat than anyone could have imagined.

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. The couple reveals some horrifying information about the future that directly relates to the creature inside the wall. Now with an understanding of the creature's motivation, Sapphire and Steel must prevent the creature's escape and manipulate time in order to save all of humanity.

Sapphire and Steel investigate strange happenings at a pawn shop. Children from the past are appearing, but how are these children connected to old photographs? What does the single tenant in the upstairs room know?

Who is the new Landlord? He confronts Sapphire and Steel but his face is not what it seems. He warns them to leave or suffer the same fate as the missing shop owner.

The missing shop owner and missing former roommate of the tenant are found in an unexpected place. Sapphire tries to contact the missing roommate. The faceless man intervenes.

Trapped Sapphire and Steel must use their wits and the help of the tenant to escape their prison and trap the faceless man and keep him from causing more harm.