Mark of the Gorilla was Number Four in Columbia's "Jungle Jim" series. Johnny Weissmuller stars as Jim, who this time around contends with homicidal fortune hunters. At stake is a buried treasure, consisting of ill-gotten Nazi loot. Villain Brandt (Onslow Stevens) hires a couple of thugs to pose as killer gorillas, in hopes of scaring the natives away from the burial site. Believe it or not, this monkey masquerade was played straight, though it's difficult not to giggle when watching the film today. As was customary in the "Jungle Jim" series, Mark of the Gorilla has two leading ladies: Trudy Marshall (the mother of actress Deborah Raffin) as Jungle Jim's assistant, and Suzanne Dalbert as an incognito European queen.