On 16 September 1967, a new comic strip called "The Mysterons" appeared simultaneously in the comic books "Solo", and its sister publication "TV Tornado". The initial story provides an adaptation of the destruction of the Mysteron city on Mars by Captain Black, as shown in the first episode of the "Captain Scarlet" television series. Following the re-creation of their city, it then goes on to depict the previously peaceful Mysterons deciding that they must protect themselves from further aggression by conquering the universe. To that end some of the Mysterons depart in a flying saucer, headed for the Andromeda Galaxy, to commence their plan.