Bwana Devil

Bwana Devil is a 1952 U.S. adventure film based on the true story of the Tsavo maneaters and filmed with the Natural Vision 3D system. The film is notable for sparking the first 3D film craze in the motion picture industry, as well as for being the first 3D film in color and the first 3D sound feature in English. Bwana Devil was written, directed and produced by Arch Oboler and stars Robert Stack, Barbara Britton and Nigel Bruce.

The film is set in British East Africa in the early 20th century. Thousands of workers are building the Uganda Railway, Africas first railroad, and intense heat and sickness make it a formidable task. Two men in charge of the mission are Jack Hayward and Dr. Angus Ross. A pair of maneating lions are on the loose and completely disrupt the undertaking. Hayward desperately attempts to overcome the situation, but the slaughter continues.Britain sends three biggame hunters to kill the lions. With them comes Jacks wife. After the game hunters are killed by the lions, Jack sets out once and for all to kill them. A grim battle between Jack and the lions endangers both Jack and his wife. Jack kills the lions and proves he is not a weakling. ........

Source: Wikipedia