Batman drives a ghost which the gang is chasing away, and warns the gang to keep away from this case for their own safety. When the Puppeteer attacks again, Fred overpowers Perpetto and his hench-puppet, and the gang unmasks them as Martian Manhunter and Detective Chimp. As Batman and his associates reveal afterwards, the Puppeteer scam was actually an initiation test for Mystery Inc. to join the ranks of Mystery Analysts of Gotham City. (thetvdb.com)