Mark of the Gorilla

Johnny Weissmüller

Jungle Jim

Trudy Marshall

Barbara Bentley

Suzanne Dalbert

Nyobi

Onslow Stevens

Professor Brandt

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Robert H. Purcell

Kramer

Pierce Lyden

Gibbs

Neyle Morrow

Head Ranger

Selmer Jackson

Warden Frank R. Bentley