UFO was a British television science fiction series created by Gerry Anderson & Sylvia Anderson and produced by the Anderson's and Lew Grade's Century 21 Productions for Grade's ITC Entertainment company. The Andersons had previously made a number of very successful marionette-based children's science fiction series including Stingray, Thunderbirds, and Captain Scarlet. He had also made one live-action science fiction movie, Doppelgänger, also known as Journey to the Far Side of the Sun, and now felt ready to move into live-action television and aim at a more adult market.