The worldâs most notorious bad guys are invited to the island fortress of super-villain Tan-Gu to compete in an Olympic-style tournament of evil, called the Evilympics. Mr. Magoo and his 12 year-old nephew Justin fight giant robot spiders, ninjas on jet skis, and Tan-Guâs mutant âBeasteensâ, as representatives of the anti-evil task force.