Captain Black engineers the death of chief test pilot Major Gravener, who is retrometabolised as a Mysteron agent as part of the Mysterons' plan to destroy the World Capital, Futura City.
Cast of Treble Cross
Francis MatthewsCaptain Scarlet (voice)
Ed BishopNarrator / Captain Blue (voice)
Donald GrayThe Mysterons / Colonel White / Captain Black (voice)
Cy GrantLieutenant Green (voice)
Gary FilesSergeant (voice)
Elizabeth MorganDestiny Angel / Nurse (voice)
David HealyDr. Mitchell (voice)
Martin KingDr. Baxter (voice)
Jeremy WilkinMajor Gravener (voice)
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