For 60 years, Star Trek has presented a diverse array of alien species as allies, adversaries, and everything in between. Including this range of aliens isn’t just a creative flourish–it plays a crucial role in the franchise’s diversity of storytelling, themes, and cultural impact. This Species Sourcebook enables Star Trek Adventures gamemasters and players to learn more about the myriad species present in the Star Trek Galaxy and to use those species to populate their main crew and expanded cast of non-player characters. Characters of every department, from command to medical, can apply the new species templates, game mechanics, and character options to deepen their gameplay experience. No matter the composition of your crew, this guide provides the means for you and your crew to play a wide range of alien species from every corner of the Galaxy! The 132-page full-color, hardcover Species Sourcebook features: Sixty (60) new alien species templates, each including a summary, sample values, attribute modifiers, traits, unique abilities, and many other details relevant to each species. More than 120 new species talents to be used with the species contained in this book or adapted for use with any other Star Trek Adventures species or your own original creations. Guidance and mechanics for creating your own original Star Trek species for use in your campaigns. Additional rules and insights on how to play a wide range of alien species, including androids, holograms, liberated Borg, mirror universe characters, and Vau N’Akat, as well as advice on using emotional states as traits. This second edition supplement is compatible with both first edition Star Trek Adventures and the Captain’s Log Solo RPG.