Tarzan and the Mermaids

Tarzan and the Mermaids is a 1948 film about Tarzan trying to prevent a woman from marrying a charlatan posing as a god.
 * Directed by Robert Florey. Written by Carroll Young, based on the character created by Edgar Rice Burroughs.

TARZAN DEFIES THE MAN-GOD'S TERROR - to Save the Queen of Pearl-Divers! (taglines)

Dialogue

 * Palanth, the High Priest: If my people knew anyone posed as Balu, they would destroy him.
 * Tarzan: If people know Balu a man, they destroy you.

Taglines

 * TARZAN DEFIES THE MAN-GOD'S TERROR - to Save the Queen of Pearl-Divers!
 * SCORES OF AQUA-CUTIES...SLAVES TO A VILLAINIOUS IDOL'S WILL!
 * BARBARIC RITUALS!...SAVAGE THRILLS!...PAGAN SPLENDORS!
 * LOVE SACRIFICE TO A HEATHEN MAN-GOD!
 * NEVER-BEFORE...Tarzan's undersea death-battle with a giant octopus!
 * Tarzan at His Best!

Cast

 * Johnny Weissmuller — Tarzan
 * Brenda Joyce — Jane
 * George Zucco — Palanth, the High Priest
 * Andrea Palma — Luana, Mara's Mother
 * Fernando Wagner — Varga, Pearl Trader
 * Edward Ashley — Commissioner
 * John Laurenz — Benji
 * Gustavo Rojo — Tiko, Mara's Fiancé
 * Matthew Boulton — British Inspector-General
 * Linda Christian — Mara