Beckett Mariner (mirror)
Beckett Mariner was a hypothetical mirror universe version of Ensign Beckett Mariner in Mirror Universe Encounter, one of the training drill holoprograms presented by Shari yn Yem to the crew of the  in 2381.

In Mariner's run-through of the program, the premise was that she had taken the place of her  counterpart, and had to infiltrate the  without arousing suspicion. Mariner failed the drill after she gave a Terran salute to  with her left hand, causing Boimler to expose her as an imposter, as the Terran Mariner was supposedly right handed. Unbeknownst to Mariner, Yem had rigged all the drills to ensure that the Cerritos crew would fail. ()

Fictional characters