Not a standalone expansion. A copy of Cosmic Encounter is required to play.
Cosmic Odyssey is a massive expansion bigger than anything Cosmic that came before it (aside from the base game, of course), and it packs enough wallop to enhance your wild and wonderful space shenanigans for countless games to come. Even if you don’t own any of the previous expansions, Cosmic Odyssey brings loads of aliens, variants, and a brand-new campaign mode to the table. It has more of everything Cosmic Encounter has to offer, and lots of things that have never been seen in the game before. It’s a never-ending odyssey, and one that no Cosmic fan will want to miss!