Gotta wonder what the anti-Marty would be like.
Rich, probably.
Definitely some science fiction going on!
Heck, I was thinking DC comics already had this subject pegged with their Multiverse.
In the DC Multiverse there are 12 numerically designated Earths as well as Earths A,B,C,C-minus, D,S,and X. And for good measure there is also the Anti-Matter Universe of Qward.
Yer wastin' yer time sweetie, he's as queer as a 3 dollar bill...
Mmmmm...Uhura! *slurp!*