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Tarzan the Terrible is a novel written by Edgar Rice Burroughs, the eighth in his series of books about the title character Tarzan. It was first published in June 1921.

In the previous novel, during the early days of World War I, Tarzan discovered that his wife Jane was not killed in a fire set by German troops, but was in fact alive.

In this novel two months have gone by and Tarzan is continuing to search for Jane. He has tracked her to a hidden valley called Pal-ul-don, which means "Land of Men." In Pal-ul-don Tarzan finds a real Jurassic Park filled with dinosaurs, notably the savage Triceratops-like Gryfs, which unlike their prehistoric counterparts are predatory. The lost valley is also home to two different races of tailed human-looking creatures, the Ho-don (hairless and white skinned) and the Waz-don (hairy and black-skinned). Tarzan befriends Ta-den, a Ho-don warrior, and Om-at, the Waz-don chief of the tribe of Kor-ul-ja. In this new world he becomes a captive but so impresses his captors with his accomplishments and skills that they name him Tarzan-Jad-Guru (Tarzan the Terrible), which is the name of the novel.

Tarzan the Terrible is an important work in the Tarzan series, continuing a sequence beginning with Tarzan the Untamed and concluding in Tarzan and the Golden Lion and Tarzan and the Ant Men, in which Burroughs' vivid imagination and storytelling abilities hit their peak, and which is generally considered a highlight of the series.

Tarzan is a fictional character, an archetypal feral child raised in the African jungles by the Mangani "great apes"; he later experiences civilization only to largely reject it and return to the wild as a heroic adventurer. Created by Edgar Rice Burroughs, Tarzan first appeared in the novel Tarzan of the Apes (magazine publication 1912, book publication 1914), and then in twenty-five sequels, three authorized books by other authors, and innumerable works in other media, authorized and not.

Tarzan is the son of a British lord and lady who were marooned on the Atlantic coast of Africa by mutineers. When Tarzan was only an infant, his mother died of natural causes and his father was killed by Kerchak, leader of the ape tribe by whom Tarzan was adopted. Tarzan is his ape name; his real English name is John Clayton, Earl Greystoke.

Tarzan has been called one of the best-known literary characters in the world. In addition to more than two dozen books by Burroughs and a handful more by authors with the blessing of Burroughs' estate, the character has appeared in films, radio, television, comic strips, and comic books.