Stargate Atlantis: 4x4
Doppelganger
During an off-world mission Colonel Sheppard unknowingly becomes host to an alien entity, which infects others in Atlantis and afflicts them with terrifying nightmares.
4 - 1Adrift (2) Sep. 27, 2007
4 - 2Lifeline (3) Oct. 04, 2007
4 - 3Reunion Oct. 11, 2007
4 - 4Doppelganger Oct. 18, 2007
4 - 5Travelers Oct. 25, 2007
4 - 6Tabula Rasa Nov. 01, 2007
4 - 7Missing Nov. 08, 2007
4 - 8The Seer Nov. 15, 2007
4 - 9Miller's Crossing Nov. 29, 2007
4 - 10This Mortal Coil (1) Dec. 06, 2007
4 - 11Be All My Sins Remember'd (2) Jan. 03, 2008
4 - 12Spoils of War Jan. 10, 2008
4 - 13Quarantine Jan. 17, 2008
4 - 14Harmony Jan. 24, 2008
4 - 15Outcast Jan. 31, 2008
4 - 16Trio Feb. 07, 2008
4 - 17Midway Feb. 14, 2008
4 - 18The Kindred (1) Feb. 21, 2008
4 - 19The Kindred (2) Feb. 28, 2008
4 - 20The Last Man (1) Mar. 06, 2008