[Ghostbuster? So, this man is from another dimension in which he's a Ghostbuster, as well? How odd. Egon blinks, scratching his chin.]

It does. You're speaking to him. Or, at least one version of Egon Spengler.

[He squints at the stranger's face, seeing if he can recognize him. Unfortunately, it's just not clicking for him.]

Are you another Ghostbuster from a different dimension, then? Two other Ghostbusters from a different dimension than mine have arrived here with me. Do you know Ray Stantz and Peter Venkman, then?