Psyphon and his evil alien crew are trying to destroy Undertown! To protect the city, Ben must navigate a slew of hazards while collecting enough strength to fight Psyphon's henchmen in hand to hand combat. Use the Omnitrix to transform into your favorite aliens and increase their power with Omnibox. Can you help Ben defeat Psyphon and save Undertown? Avoid bombs, missiles, and other dangers! Collect Omnitrix power and bonuses as you go!