The characters are three teenagers; two are male, and one is female. One of the males is the leader, and the other is somewhat fat and always worried. The female might be Asian (I don't recall), but I do know that they work in a movie theater where they entered other dimensions, and the portal to those worlds is the giant movie screen that's in the theater. The main villain is some guy who owns a restaurant right next door to the movie theater.
I remember one episode; it starts with them in a world where everyone are zombies, and the virus came from a food store. One of the members eats the food from that store and turns the two others, gets out, and finds a boat to get to a military base. But the female member gets infected, and rides a zombie shark after the leader of the group, who is on the boat. That's all I've got left of my memory.
I'm 17, and I watched this animated series when I was ether 10 or 14. Could you guys help me figure this out, please? I tried looking it up, but didn't find anything.