Battle, befriend, or become more than 100 bizarre alien life forms in this all-new creature collection for the Starfinder Roleplaying Game! On countless worlds orbiting countless stars, strange and wonderful creatures await discovery. In this book, you'll find rules and background information about creatures ranging from undead androids and robot dragons to deadly laser-spined flowers and mysterious sea skeletons. You'll also find plenty of new equipment and player options, including a new set of augmentations that allows your character to adopt the strange features of dozens of existing playable alien species. Explore the extraordinary with Starfinder Alien Archive 4!