Aired Thursday May 23, 4:00pm - 5:00pmon Sky Mix

Stargate Atlantis

Series 4 Episode 4: Doppelganger

Sheppard encounters a crystalline species similar to one that Jack O'Neill encountered ten years ago, but this time around it's different, the alien entity is evil and invading the team's nightmares in a bid to destroy the rest of the expedition.

Adventure / Science fiction
Original air date
Cast and crew
  • Robert CooperDirector
  • Joe FlaniganMajor/Lt. Colonel John Sheppard
  • Amanda TappingColonel Samantha Carter
  • David HewlettDr. Rodney McKay
  • Rachel LuttrellTeyla Emmagan
  • Jason MomoaRonon Dex
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