Jewel Staite and Amanda Tapping by Eike Schroter/SciFi Channel Jewel Staite and Amanda Tapping by Eike Schroter/SciFi Channel

Sci Fi Channel has greenlit a fifth, 20-episode season of Stargate Atlantis, it was announced late Tuesday. The series, which has been averaging 1.8 million total viewers this season (versus the cabler's typical audience of 1.3 mil), "truly came out from under the shadow of its sister series [ Stargate SG-1] this year and proved that it's a hit in its own right," says Sci Fi exec VP Mark Stern.