

This children's fantasy tells the story of a 12-year-old boy who discovers a complex underwater world where young children are held prisoner by an evil shark and an eel.
Bernard Cribbins
Mr. Masterman / Voice of Eel
James Mason
Mr. Grimes / Voice of Killer Shark
David Jason
Cyril the Walrus
Billie Whitelaw
Mrs. Doasyouwouldbedoneby / Old Crone / Mrs. Tripp / Woman in Black / Water Babies 'Gate Keeper'