- As Mystery Inc. investigates rumors of strange happenings at an eerie museum filled with artifacts from their past adventures, it quickly becomes more and more obvious that an old adversary lurks beneath the shadows seeking their destruction: Mr. E, unmasked!
- The puppeteer master behind these events has resurfaced from his exile with one plan – to finally finish off Fred, Velma, Shaggy, Daphne, and their faithful pup Scoobert Doo once and for all! This showdown will force both parties to push the limits of their intellect and their heart.
- Facing insurmountable odds as the threat draws near, will Team Mystery Inc. emerge victorious to bring this season-long arch to a thrilling conclusion? Only time will tell, as old ghosts return on Scooby Doo: Mystery Incorporated!