After solving their last mystery at Spooky Island, the Mystery Inc. gang is back in Coolsville, where they are being honored with their very own exhibit at the Coolsonian Criminology Museum. However, when a masked villain steals costumes of classic monsters on display and brings them to life, the gang must come out of retirement to solve the case.
Elektra the warrior survives a near-death experience, becomes an assassin-for-hire, and tries to protect her two latest targets, a single father and his young daughter, from a group of supernatural assassins.
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