Thriller - Season 1 - Eps 4: 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
About Thriller

Title: Thriller
First Air Date: 1973-04-14
Last Air Date: 1976-05-22
Status: Ended
Rating: 6.6/10 (from 11 votes)
Language: EN
Seasons: 7
Total Episodes: 44
Network: ITV1 Associated Television Yorkshire Television
Genres: Drama, Crime, Mystery
Production Companies: ITV, Associated Television (ATV), ABC, CBS
Synopsis
Thriller is a British television series, originally broadcast in the UK from 1973 to 1976. It is an anthology series: each episode has a self-contained story and its own cast. As the title suggests, each story is a thriller of some variety, from tales of the supernatural to down-to-earth whodunits.