Stargate Atlantis will continue to a fifth season. 20 episodes were ordered, despite ratings. The 100th episode will be the finale.

"All of us at MGM are pleased to be extending the Stargate legacy with 20 new original episodes of Stargate Atlantis for our friends at SCI FI," MGM's Charles E. Cohen, Senior Executive Vice President Finance and Corporate Development, said. "Viewers the world over clamor for exciting new stories of space exploration, distant civilizations and the marvels of technology, all of which continue to be delivered by Stargate Atlantis."

Eureka was also greenlighted for another season.

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