Earth-X Marks the Spot (not THAT Earth-X) (Jimmy Olsen #93)

Jimmy stumbles upon Professor Potter's dangeraously unattended dimensional transporter - literally stumbles, as in trips and activates it - and finds himself in a crazy mixed up world where Perry White loves Jimmy as a son! Clark Kent is the Joker! Matadors wear blue capes instead of red! Oh, and Jimmy has super powers and a costume that inexplicably has bat-ears. Perhaps on THIS Earth, you'll listen in!