Mitch, also known as Big Mitch, is an intergalactic criminal. Among his crimes are poaching various extraterrestrial creatures, imprisoning them aboard his clandestine space station, and attempting to seize absolute control over the galaxy. Deviously clever and highly elusive, Mitch has made himself known across the universe as a formidable threat. However, his plans are always brought to a halt by Meap, an experienced agent of an intergalactic security force, with the frequent assistance of humans Phineas, Ferb, Isabella, and Candace.