James Mason
Mr. Grimes / Voice of Killer Shark
Acting
Bernard Cribbins
Mr. Masterman / Voice of Eel
Acting
Billie Whitelaw
Mrs. Doasyouwouldbedoneby / Old Crone / Mrs. Tripp / Woman in Black / Water Babies 'Gate Keeper'
Acting
Tommy Pender
Tom
Acting
Samantha Gates
Elly
Acting
Joan Greenwood
Lady Harriet
Acting
David Tomlinson
Sir John / Voice of Polar Bear
Acting
Jon Pertwee
Salmon
Acting
David Jason
(voice)
Acting
Una Stubbs
(voice)
Acting