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Following the HUGE success of TARZAN TRIUMPHS, RKO released TARZAN'S DESERT MYSTERY, which again offered Nazi villains (Otto Kruger, who'd played a similar role in Hitchcock's SABOTEUR, a year earlier, and veteran screen baddie Joe Sawyer), an American girl magician (vivacious Nancy Kelly, who sings a mean "Boola Boola"), and a chance to combine Nazi duplicity with an 'Arabian'-themed adventure (which was popular escapism during the war years). Even a fantasy element was tossed in, as giant lizards and a mechanical spider 'passing' as 'prehistoric' appear in a 'lost jungle' climax.

The plot is simple; Jane (at this point serving as a military nurse in London), sends Tarzan a letter, asking him to send his jungle fever remedy. The ingredients are in a 'lost' jungle, across a vast desert, leading Tarzan, Boy, and Cheeta into the adventure...

Dated, certainly, but a very enjoyable RKO Tarzan entry!