Steed and Dr Keel return to action in these four recreations of classic lost episodes.

'Nightmare' by Dan Starkey, from a storyline by Terence Feely. When one of his patients, an experimental scientist, goes missing, Dr Keel ends up impersonating him. But not all doctors are on the side of the angels.

'Girl on the Trapeze' by Dennis Spooner, adapted by Rae Leaver. The circus has come to town - but after Keel witnesses an apparent suicide, it becomes clear that the clowns are concealing something sinister behind the scenes.

'Crescent Moon' by Phil Mulryne, from a storyline by Geoffrey Bellman and John Whitney. On a Caribbean Island, Steed finds himself caught up in a curious case of kidnapping, where if he wants to save a missing girl, he's got to find out what's really going on...and quickly.

'Diamond Cut Diamond' by John Dorney, from a storyline by Max Marquis. A smuggling ring is leaving a trail of bodies in its wake. Steed goes undercover as an air steward to investigate, but can he confront the culprit before it's his head on the block?

Adapted by John Dorney, Rae Leaver, Phil Mulryne and Dan Starkey.

Directed by Ken Bentley.