UFO is a British television science fiction series created by Gerry Anderson and 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. They 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.