The Star Beast is a 1954 science fiction novel by Robert A. Heinlein about a high school senior who discovers that his extraterrestrial pet is more than it appears to be. The novel was originally serialised, somewhat abridged (as Star Lummox), in The Magazine of Fantasy & Science Fiction (May, June, July 1954) as Star Lummox and then published in hardcover as part of Scribner's series of Heinlein juveniles. Plot summary In the future, Earth has had interstellar spaceflight for centuries and has made contact with numerous extraterrestrial intelligent species. John Thomas Stuart XI, the teenage protagonist, lives in a small Rocky Mountain town, Westville, caring for Lummox, an extraterrestrial beast his great-grandfather had brought home. Lummox has learned how to speak, and has gradually grown from the size of a collie pup to a ridable behemoth—especially after consuming a used car. The childlike Lummox is perceived to be a neighborhood nuisance and, upon leaving the Stuart property one day, causes substantial property damage across the city. John's widowed mother wants him to get rid of it, and brings an action in the local court to have it destroyed. Desperate to save his pet, John Thomas considers selling Lummox to a zoo. He rapidly changes his mind and runs away from home, riding into the nearby wilderness on Lummox's back. His girlfriend Betty Sorenson joins him and suggests bringing the beast back into town and hiding it in a neighbor's greenhouse. However, it is not easy to conceal such a large creature. Eventually, the court orders Lummox destroyed. City officials try several methods to kill Lummox but fail, as his alien physiology appears to be virtually invulnerable to ordinary weapons or poisons, and Lummox does not even realize they are attempting to execute him. Meanwhile, at the Earth government Department of Spacial Affairs, Mr. Kiku, an experienced diplomat, is dealing with the Hroshii, a previously unknown, advanced and powerful alien race. They demand the return of their lost child, or they will destroy Earth. A friendly alien diplomat of a third species intimates that the threat is not an empty one. Initially, no one associates Lummox with the newcomers, in part due to the size difference (Lummox was overfed). Lummox is finally identified as important royalty of the Hroshii, as well as approximately female (the Hroshii have six sexes). It turns out that the relationship between John Thomas and Lummox