Stargate Atlantis season 4
Television series season
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![Amazon.com: Stargate Atlantis: Season 4 [Region 2] : Movies & TV](/imgres?imgurl=https://m.media-amazon.com/images/I/51HQyjm81tL._AC_UF894,1000_QL80_.jpg&imgrefurl=https://www.amazon.com/Stargate-Atlantis-Season-Region/dp/B002U0T6US&h=1000&w=716&tbnid=htpjX9BMwKj0YM&q=Stargate+Atlantis+season+4&tbnh=149&tbnw=107&usg=AI4_-kR2ZbeMAjqFz7Xodzvlnr4FpxMNRg&vet=1&docid=IO6NZPcHoR_6kM&sa=X&ved=2ahUKEwjz5eSxl_uFAxXJk4kEHfDQAVAQ9QF6BAgAEAg)
The fourth season of Stargate Atlantis, an American-Canadian television series, began airing on September 28, 2007 on the US-American Sci Fi Channel. The fourth season concluded after 20 episodes on March 7, 2008 on Sci Fi. Wikipedia
Number of episodes: 20