Add to the base game: 10 new powers A planet system and tokens for a fifth player Expands: Cosmic Encounter Other expansions: Cosmic Encounter - Eon Expansion #2 Cosmic Encounter - Eon Expansion #3 Cosmic Encounter - Eon Expansion #4 Cosmic Encounter - Eon Expansion #5 Cosmic Encounter - Eon Expansion #6 Cosmic Encounter - Eon Expansion #7 Cosmic Encounter - Eon Expansion #8 Cosmic Encounter - Eon Expansion #9 - BoardGameGeek