Multidimensional Fighters

Four friends embark on an epic journey to save the Earth from a portal to a universe where Greek mythology and other creatures walk the Earth. This alternate Earth is covered with zombies and a strange radiation that has no effects as long as they don't stay in it too long... There is loss, illusion and betrayal, many times there is death but sometimes there is happiness and joy. The only question is, how often will it occur? (Currently unfinished)