The programme occasionally spun off ideas into full-blown series such as "Armchair Mystery Theatre", hosted by Donald Pleasence, which specialised in crime and mystery thrillers. A 1962 adaptation of John Wyndham's short story "Dumb Martian", scripted by Clive Exton, was a deliberate showcase for the spin-off science fiction anthology "Out of This World". Two 1967 episodes became series. One of these was developed into the sitcom "Never Mind the Quality, Feel the Width", while the other, "A Magnum for Schneider", became the pilot for the spy series "Callan".