"Treble Cross" is the 21st episode of the British Supermarionation television series Captain Scarlet and the Mysterons. Written by Tony Barwick and directed by Alan Perry, it was first broadcast in the United Kingdom on 23 February 1968 (1968-02-23) on ATV Midlands.In this episode, Captain Black engineers the death of a test pilot as part of a plot to obliterate the world capital, Futura City, only for his victim to be revived in hospital.