This expansion was published by Descartes Editeur & West End Games. It is different than EON's Expansion #1 in the fact that it contains two planet systems (rather than one) and 15 aliens (rather than 10).
Add to the base game:
* 15 new powers
* Two planet systems and tokens for a fifth and sixth player
Expands:
* Rencontre Cosmique (Cosmic Encounter- French Edition)
Other expansions:
* Cosmic Encounter: Expansion Set #1
* Cosmic Encounter: Expansion Set #2
* Cosmic Encounter: Expansion Set #3
* Cosmic Encounter: Expansion Set #4
* Cosmic Encounter: Expansion Set #5
* Cosmic Encounter: Expansion Set #6
* Cosmic Encounter: Expansion Set #7
* Cosmic Encounter: Expansion Set #8
* Cosmic Encounter: Expansion Set #9