"Brad Boimler (mirror)" is a title based upon conjecture.
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Upon being brought to the Doctor's universe, Brad Boimler - a resident of another universe - asked if they were in the Mirror Universe, noting that he couldn't handle another doppelgänger of himself; when River Song answered that he was not, Boimler hoped that there would not be any transporter accidents. (GAME: A Trek to Skaro [+]Loading...["A Trek to Skaro (episode)"])