
An Echo of Theresa
While a couple vacations in London, the husband begins to act strangely, calling his wife "Theresa," and they become involved in espionage. Paul Burke, Polly Bergen, Dinsdale Landen, Basil Henson, Vernon Dobtcheff, Meriel Brooke, William Job, Roger Hume, Larry Taylor, Betty Woolfe, Neville Phillips, Ted Richards, John Caesar
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S1 E2
Possession
A couple moves into a sinister old country house, and the husband is taken over by strange forces. John Carson, Joanna Dunham, Hilary Hardiman, Athol Coats, James Cossins, Richard Aylen, Jack Galloway, Mary Ann Severne

S1 E3
Someone at the Top of the Stairs
When two young women rent a room in a dark house filled with strange inhabitants, one of them is killed and the other is haunted by a mysterious man who appears at the top of the stairs. Donna Mills, Judy Carne, David de Keyser, Francis Wallis, Alethea Charlton, Brian McGrath, Peter Cellier, Clifford Parrish, Scott Forbes, Rhoda Lewis, Alan Roberto, Laura Collins, Richard Corbet, Charles Hill

S1 E5
The Colour of Blood
A serial killer escapes from an asylum and picks a seemingly innocent woman as his next victim, but she is not as innocent as she seems. a.k.a "The Carnation Killer" (US title)

S1 E6
Murder in Mind
A woman who has been in a car accident and has amnesia believes that she has committed murder and turns herself into the police. Richard Johnson, Zena Walker, Donald Gee, Ronald Radd, Robert Dorning, Christina Greatrex, Anthony Boden, David Lampson