When the first manned flight to Venus returns to Earth, the rocket crash-lands in the Mediterranean near a small Italian fishing village. The locals manage to save one of the astronauts Colonel Calder, the mission commander. A young boy also recovers what turns out to be a specimen of an alien creature. Growing at a fantastic rate, it manages to escape and eventually threatens the city of Rome.
Congotanga, West Africa, has no extradition laws; the government is controlled by foreign gangsters, headed by Carl Rittner. The latest plane from Europe carries lovely Louise Whitman, fleeing a French murder charge, and Mannering, who pays resident hit man O'Connell to kill her. Through a chain of circumstances Louise, O'Connell, and heroic surveyor David Carr end up alone in the jungle on Carr's mission to determine the true border of Congotanga... in which Rittner is keenly interested.
A silver-tongued poet and self-proclaimed "King of the Beggars" searches old Baghdad for a rich bachelor to marry his dreamy daughter, Marsinah. Along the way, he poses as the renowned sorcerer Hajj and gets in and out of scrapes with an elderly thief, a dim-witted wazir, and his wife. Meanwhile, his daughter develops feelings for a handsome caliph.
A mysterious American gets mixed up with gunrunners in Syria.