This movie was the first Tarzan movie ever made, and is based on Edgar Rice Burroughs' original novel "Tarzan of the Apes." It adapts only the first part of the novel, the remainder becoming the basis for the sequel, "The Romance of Tarzan." The film is considered the most faithful to the novel of all the film adaptations. While Elmo Lincoln is generally credited as the first movie Tarzan, that distinction actually belongs to Gordon Griffith, who plays the character as a boy. Lincoln, a powerful but beefy actor, does not conform to the modern expectation of an athletic Tarzan. Nonetheless, he came closer to the ideal in one respect, killing a lion that went berserk on screen. The lion, an aged specimen, was also somewhat handicapped in the struggle by having been drugged for its screen appearance.