Kadro (10)
James MasonMr. Grimes / Voice of Killer Shark
Bernard CribbinsMr. Masterman / Voice of Eel
Billie WhitelawMrs. Doasyouwouldbedoneby / Old Crone / Mrs. Tripp / Woman in Black / Water Babies 'Gate Keeper'
Tommy PenderTom
Samantha GatesElly
Joan GreenwoodLady Harriet
David TomlinsonSir John / Voice of Polar Bear
Jon PertweeSalmon
David Jason(voice)
Una Stubbs(voice)