The online version of Cosmic Encounter (often called CEO) was released in 2003. The game can be played over the internet by four players, with bots filling in empty spots. As of mid-2009, the game has 35 aliens, some of which are designed for online play. As it is in the format of a computer game instead of a board game, CEO's terminology differs from the terms of the other versions; for example cards are called pods.
There are 35 aliens available online, including 6 new ones and two designed for online play. 6 of them (Clone, Macron, Oracle, Trader, Warrior, Zombie) can be used by guests or free members; the others have to be paid for using a membership system.