<-- Previous EpisodeNext Episode -->
While working on Merlin's phasing device and using a protective force shield, Sam is shunted into a parallel dimension where her counterpart, Major Sam Carter, was trying to tap into alternate dimensions for energy. Trapped in a world where Major Lorne commands SG-1, General Hammond runs SGC, Hank Landry is President, and Rodney McKay is her ex-husband, Sam must work with them to protect Earth from the Ori. However, once she succeeds she finds they're not willing to let her go home.
Michael Shanks (Daniel Jackson) does not appear in this episode.
Christopher Judge (Teal'c) and Claudia Black (Vala) only appear in the final scene of this episode.
Despite the fact that they appeared in seven episodes of the series together, Christopher Judge (Teal'c) and David Hewlett (Dr. McKay) never shared a scene.
This episode marks the final appearances of Don S. Davis (General Hammond) and David Hewlett (Rodney McKay) on the series.
Sam: Well, this is going to come as a bit of a shock, but I'm not who you think I am.
Rodney: Oh my God, you're a lesbian! Is that what you're trying to tell me?
Sam: What?! No! McKay!
Rodney: Well, no, I... I just…I think... I thought, uh…hmm.