The Planet of Peril, later republished as Planet of Peril, is a 1929 science fiction novel by Otis Adelbert Kline. Originally serialized in six parts in Argosy All-Story Weekly during the summer of 1929, it was published in hardcover later that year by A. C. McClurg and reissued in a lower-price edition by Grosset & Dunlap. It was revived in 1961 as an Avalon Books hardcover and saw its only mass market paperback edition from Ace Books in 1963.^[1] The later editions, well after Kline's death, were revised and shortened.^[2]

Planet of Peril is the first volume in Kline's "Grandon" trilogy. It is a planetary romance, telling the story of Robert Grandon, who exchanges his mind with an inhabitant of Venus, finds himself a slave, escapes his captors, and rises to leadership of an army of rebels. He eventually marries the princess of the oppressive regime and becomes a benevolent emperor.^[3]

Amazing Stories described Planet of Peril as "an exceedingly well-spun yarn [which] can heartily be recommended to all our readers, and to all lovers of imagination-stirring fiction".^[3]

P. Schuyler Miller wrote that Planet was "an open imitation of Burroughs, though on a different planet".^[4] E. F. Bleiler found the novel to be "sword-play and fantastic adventure in imitation of Edgar Rice Burroughs, describing it as "competent pulp adventure".^[2]