In BITLAND — a parallel world existing in the shadow of Earth — the ordinary residents face extinction. An entity called NECTERION has crossed the dimensional boundary with a plan to first dominate BITLAND and then eliminate humanity on Earth entirely. GUIMO, a fearless galactic lizard with considerable firepower and accompanied by robotic companions called the Eggy Robots, launches into BITLAND to fight through wave after wave of NECTERION's forces and find a way to stop the plan before it crosses dimensions.