Alternate reality versions of Carter and Kawalsky use the quantum mirror to arrive at a secured building in the top secret Area 51 in "our" universe. When the alternate Carter begins to feel the effects of temporal distortion, SGC must come up with a plan to send the alternates back and help them defeat their Apophis.
Alternate reality versions of Carter and Kawalsky use the quantum mirror to arrive at a secured building in the top secret Area 51 in "our" universe. When the alternate Carter begins to feel the effects of temporal distortion, SGC must come up with a plan to send the alternates back and help them defeat their Apophis.
Guest Cast

Peter DeLuise
voices InterviewerCast Appearances
Episode Discussion
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Awards...
Nominated Leo for "Best Performance by a Female in a Dramatic Series" (Amanda Tapping)
Goofs...
When the team travels to the alternate reality, both the corridor in front of the storage room and to the side are damaged despite not being so before. Though it could have been caused by Kawalsky's grenade, the area in front of the storeroom was too far away from the explosion to have been damaged.
Goofs...
When Dr. Daniel Jackson and Teal'c go through the Quantum Mirror back to their reality they would have appeared on opposite sides, but they appeared as if it was a mirror image. Teal'c touched the mirror with his right hand and Daniel touched it with his left. Though on the other side Daniel is touching it with his right hand and Teal'c was touching it with his left hand.
Goofs...
Major General George S. Hammond incorrectly refers to P3R-233 as "P3X-233" during the debriefing of Dr. Samantha Carter and Major Charles Kawalsky.
Goofs...
The Asgard homeworld address shown being dialed is different from the one used in "The Fifth Race" (it would appear these are the same symbols just orientated differently).
Goofs...
Major Samantha Carter claims that "...In order to dial the Asgard homeworld they had to provide us with a generator that transferred power to the Gate's capacitors." Actually, in "The Fifth Race", Colonel Jack O'Neill built the device using the knowledge of the Ancients. Carter also claims that "You know, I had a hard time trying to figure out how to make this work the first time, let alone make it work again." She never worked on it or knew what it did until after it stopped working.