S4·E4 Doppelganger
Core
Aired October 18, 2007
Synopsis
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.
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Frequently Asked Questions
When did Season 4 Episode 4 of Stargate Atlantis air?
Season 4, Episode 4 ('Doppelganger') originally aired on October 18, 2007.
How long is Season 4 Episode 4 ('Doppelganger')?
The episode follows the standard broadcast runtime for Stargate Atlantis.
What happens in Stargate Atlantis Season 4 Episode 4?
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....