Young siblings Dan and Helen must protect their new friend, a strange blue alien boy they name Peep-Peep, from the terrifying evil alien known only as The Thin (Space) Man, who's after him.
Sylvestra Le Touzel
as Helen
Stephen Garlick
as Dan
Anthony Woodruff
as Mr Bunting
Colin Mayes
as Peep-peep
John Woodnutt
as The Thin Man
Loftus Burton
as Tom
Gabriel Woolf
as Peep-peep's father
