The Mysterons are fictional extraterrestrial beings from the British science fiction television series Captain Scarlet and the Mysterons. They are depicted as a race of Martians who possess the ability to manipulate matter and create duplicates of living beings. Their primary goal is to seek revenge on Earth after an incident involving a Martian probe. In the series, the Mysterons communicate through a mysterious voice and often threaten humanity. They are known for their iconic catchphrase, "We are the Mysterons," which signals their intentions. The main protagonist, Captain Scarlet, is a human agent who battles against the Mysterons to protect Earth from their schemes.