On screen
Cast
20 credited performers
Alexander Scourby
Self - Narrator
Richard Kiley
Narrator
Artwork unavailable
Frank C. Craighead
Self
Artwork unavailable
John Craighead
Self
Leslie Nielsen
Narrator (voice)
Jane Goodall
Self
Orson Welles
Narrator
Dian Fossey
Self
Artwork unavailable
Birute Galdikas
Self
Glenda Jackson
Narrator
Artwork unavailable
John Craighead
Self
Joseph Campanella
Narrator (voice)
Artwork unavailable
Frank Craighead Sr.
Self
Richard Basehart
Narrator (voice)
E.G. Marshall
Narrator
Ian Holm
Narrator (voice)
John Huston
Narrator (voice)
James Whitmore
Narrator (voice)
Artwork unavailable
Musindo Mwinyipembe
Narrator (voice)
Eugenie Clark
Self (as Dr. Eugenie Clark)