Stanley Baker was mostly a film actor, and had been extremely popular in the fifties and sixties as a leading man before becoming a character-actor. It was seeing Baker on television. Ironically, his last work would also be on the small screen; the miniseries adaptation of How Green Was My Valley wherein he was dying of lung cancer during production, and passed away shortly after filming.
Was an episode of the anthology series Thriller. However, as far as the genre goes, it is a whodunit mystery, not a thriller.
Shot on video tape.