It Came from the Stars! The Alien Bestiary brings you an incredible array of sci-fi and space-themed monsters and menaces for the Starfinder Roleplaying Game! The creatures you'll find within are perfect for whenever your heroes venture into the dark tapestry of space or have to defend their homeworld from alien invasion by eldritch horrors from beyond the stars, whether you use the official Starfinder setting, a universe of your own design, or a dedicated sci-fi saga like the Legendary Planet Adventure Path or in the Aethera Campaign Setting! You'll find allies and adversaries within these pages, from playable races for your sci-fi game to cosmic horrors and apocalyptic enemies inspired by classic themes of science fiction. This volume collects nearly 300 monsters from CR to CR 30, including template grafts and starship-level creatures from tier 4 to 18. You'll find residents of the Legendary Planet and Aethera settings, Starfinder versions of classic creatures like the myrmidon robot, plasma ooze, and star-spawn of Cthulhu, alongside brand-new never-before-seen monsters like the asteroid worm, star fairy, meteor dragon, and supermassive singularity! The Alien Bestiary is more than just monsters too, with appendices devoted to cults of the Great Old Ones, creatures of the Aethera system, creature indices by type and CR, high-tech traps and hazards, and spells, feats, and expanded rules for aetheryte radiation, vacuum, and more! The PDF version, of course, is hyperlinked and bookmarked for your convenience, and the book is packed with incredible artwork and delightful design by some of the best authors in the business. These monsters are dynamic and cinematic in how they play at the table, with ecology, history, and lore that are a pleasure to read. Don't let your Starfinder Roleplaying Game campaign get lost in space or just be a trek among the stars! Grab a copy of this incredible 448-page monster accessory today and Make Your Game Legendary!