The Avalon Hill version of Cosmic Encounter was released in 2000. While its production values were high, it was rather simpler than its predecessors (it only included 20 aliens - none of which were new - and no flares, and only supported up to four players) and received no expansions, and for this reason is considered by fans to be the weakest iteration of the game in terms of content.
This edition is notable for making changes to many of the game terms that would end up being carried forward through to the current edition.