Forum:So Finn is in another dimension?

http://images4.wikia.nocookie.net/__cb20091227230730/adventuretimewithfinnandjake/images/archive/b/bc/20100401212842!Wiki.png

So what the hell just happened, did they fuse with the jake and finn from the other dimension or did the creators just show what the dimension was like and then they're going to show jake and finn and the lich go through the portal. I'm so confused.