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Synopsis

McKay's efforts to harness the energy of an alien planet's atmosphere allows for a return trip to Earth -- but the team may not be able to return to Atlantis.

Guest stars

Gary Jones

Walter Harriman

Garwin Sanford

Simon Wallis

Don S. Davis

Major General George Hammond

Noah Beggs

Dex

Stephen Spender

Mitch

Robert Weiss

Scientist