Captain Indigo was a character from the Captain Scarlet And The Mysterons episode Spectrum Strikes Back. He was a Spectrum agent who disguised as a waiter during at the first Spectrum Intelligence conference. Hoping to infiltrate the conference, the Mysterons used Captain Black to assassinate him. Indigo's cover was blown by General Peterson using the C28 Detector. Indigo set the master controls of the hunting lodge down, crushing the underground conference room. Captain Scarlet and the 2nd Warden gave chase, not only saving the delegates but providing a pratical use of the Mysteron Gun.
Captain Indigo was voiced by Gary Files.