When the teenage sleuths are kidnapped by a flaming skeletal spirit called Lord Infernicus (also voiced by Rick D. Wasserman), the sidekicks are left to solve the mystery.
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Jonathan Wellington "Mudsy" Muddlemore and his team appear in the Scooby-Doo! Mystery Incorporated episode "Mystery Solvers Club State Finals" with Jonathan Wellington "Mudsy" Muddlemore voiced by Tom Kenny and Boo the Cat voiced by Rick D. Wasserman.
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