When an alarm sounds from Gotham Chemical Storage, the assembled Mystery Analysts head for the warehouse, where they find that several phials with a radioactive isotope have been stolen. is asked to take the lead in the next case for the Analysts. arrives at the Analysts' headquarters, where they additionally meet Question, Black Canary and Plastic Man, as well as Aquaman, who is not yet a member. to join the ranks of Mystery Analysts of Gotham.

As Batman and his associates reveal afterwards, the Puppeteer scam was actually an initiation test for Mystery Inc.

When the Puppeteer attacks again, Fred overpowers the ghost and his hench-puppet, and the gang unmasks them as Martian Manhunter and Detective Chimp. Batman warns the gang to leave the sleuthing to professional mystery solvers. are being chased by a ghost and a puppet when Batman appears and drives them away. However, things take a turn when a case from Batman's past comes back to haunt him and it is up to Mystery Inc. Mystery Inc. are inducted into the Mystery Analysts of Gotham. 9.5 Inconsistencies/continuity errors and/or goofs/oddities.9.4 Animation mistakes and/or technical glitches.

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