Four electric company employees stumble across a scientific experiment while preparing a vacant building for demolition so that a coffee shop can be built in it's place. They unwittingly activate power to a portal that leads to a parallel world where everything looks identical to their world. In the parallel universe mankind is almost extinct. The last remnants are fighting for their survival against a mutant spider race that turns poisoned prey into mutants under their control. The unwitting heroes join up with the last survivors in an attempt to return to their universe before the queen and her soldiers kill them all. In the end only the primary character and a girl from the parallel universe make it back.