One of those 'best ever' Children's Film Foundation adventures, a sci-fi fable about a couple of tearaway kids who come into possession of the titular object - a mini UFO with a mind (and appetite) all of its own, who must avoid the RAF and the clutches of a scheming thief (the excellent and creepy Ron Pember) in a bid to return to its mothership. An '80s standby on television where I first saw it and where it stayed in my mind over the subsequent decades, this features superb special effects scenes, done cleverly on a low budget, which really stand the test of time to this day. It's well made and engaging, funny and creative, and to my mind is better even than STAR WARS which it copies on occasion. A fantastic little production.