[Even without him saying anything, the stunned look on his face gives Jim the answer right away.]

I--yeah, actually, that's right. [Finally, some of the tension leaves him, and he gives Jim a tiny smile.] I was on the ship called Eluvio before the portal pulled me here, and so were you. Um, you're not the first person I've run into that's forgotten everything, though.

[His expression turns just slightly bashful.] Have you...do you know if Dr. McCoy is here, too? I know the two of you are close. [And he thinks it'd be a shame for them to be separated, even if Jim doesn't remember anything of Eluvio.]