Treble Cross is the 24th produced, and the 22nd broadcast, episode of the British television series Captain Scarlet and the Mysterons.
Captain Black brings about the death of a test pilot, and his victim's reconstruction tries to carry out the Mysteron threat to destroy the world capital, Futura City. However, when the attempt backfires, it is discovered that the real plotter has been resuscitated and is alive in hospital!
Can Spectrum deceive the Mysterons into believing that the original pilot is their own, and - in so doing - apprehend Black, at last?
- Filming commenced on 14 September 1967 and finished about two weeks later.
- Dr. Mitchell's puppet later went on to play Matthew Harding in The Secret Service.
- Fireflash appears on the right in establishing shots of Slaton Air Base, whilst Skythrust appears in the middle of shot and the Magnacopter is on the left of the Slaton Air Base sign.
- The “World of 2068” section of the Complete Book of Captain Scarlet gives Dr. Mitchell and Dr. Baxter’s first names as Edward and Paul, respectively; and the script identifies Major Gravener’s first name as Buchanan, or Buck for short.