Mary and Bobby Trevor are castaways befriended by Tarzan. When Lord arrives, looking for the family heir, Black John tries to fill that role and marry Mary in England. Tarzan shows up and marries her instead.
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Tarzan the Mighty (1928) is a action movie. Starring Frank Merrill, Al Ferguson, Natalie Kingston. Rated 6.8/10 on TMDB. Watch it online free on ZapFlix.