From the Back Cover Aliens are everywhere in the universe of the Starfinder Roleplaying Game, their intent ranging from peaceful to pernicious. From robot dragons to crystal-infused humanoids and polyphonic gels to sun-skimming beetles, the creatures in this codex will challenge adventurers no matter what strange worlds they're exploring. What's more, player rules for a variety of species let players not just fight aliens but be them! Inside this book, you'll find the following: Nearly 100 uncanny life-forms both classic and new, from the batlike grioth and horrifying brain collector to the vengeful endling and dreaded plasmalisk. A dozen races with full player rules, letting you play everything from a fungus-uplifted animal to a humanoid made of magical coral. New alien technology to help give your character an edge, including armor, weapons, magic items, and more. New rules for grafting the strange physical traits of other species onto your own character, creating a staggering array of customization options!