Associate of Samantha Carter in an alternate reality. Both she and Bennett were working on an experiment to harness energy from pockets of multiple parallel universes, similar to Rodney McKay and Jeannie Miller's interdimensional energy collector.
Instead, the two captured an alternate-reality version of Samantha Carter who had been performing experiments with Merlin's computer. Her arrival destroyed the lab and everything in it, including Bennett and the first Carter.
The Road Not Taken - In an alternate reality, Bennett and Carter work against the clock to stop the Ori using an alternate-dimension energy collector of their own devising.