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In the future, in a dystopian Endsville, an evil being known as the "Lord of Horror" orders his henchmen to go back in time to eliminate Billy and Mandy and prevent them from reaching a powerful hand-like artifact that the Lord of Horror has in his possession. Billy and Irwin of this time hope their past selves can stop the Lord of Horror's evil plans.

Two weeks prior, Grim is sued for dereliction of duty and misuse of his abilities by his old rival, the Boogey Man, the former having failed to reap General Skarr (who had accidentally created a hole in his chest) thanks to an intervention from Billy and Mandy. Grim and the children (including Irwin) are set to be exiled by the Underworld Court and placed in the custody of Boogey, with Grim being stripped of his job and powers and Numbuh 3 of Codename: Kids Next Door as his court-appointed replacement. Boogey reveals it was part of his plan to steal Horror's Hand, an artifact capable of bringing people's deepest fears to life and transforming anyone who conquers their fear into the scariest and most powerful being in existence; Boogey himself believes that with its power, children will fear him again. The group eventually escapes and plans to obtain the hand for themselves for various reasons (Grim believes it will get him his job back, Mandy sees it as the way to conquer the world, Irwin thinks it will help him win Mandy's heart and Billy just wants to use it to get a candy bar).

Both groups eventually reach where the hand is held, where they meet Horror the Ancient (guest star George Segal), a living statue that cut off the hand -originally his left hand- having placed his fears within it. To obtain the hand, two rivaling groups must embark on a race across the Cannibal Run - the most dangerous section of the River Styx - as well as facing their worst fears. Grim and the children win and scrape to obtain the hand. Billy, Irwin and Mandy are easily subdued by their respective worst nightmares (a spider-clown-mailman hybrid, telling jokes to wild bears and growing up into a cheerful woman married to Irwin), leaving Grim to claim the hand unaffected, revealing he lives his worst nightmare every day - living with Billy and Mandy. The hand however is almost immediately stolen by Boogey (who uses it to scare Grim to pieces, though Grim actually blew himself up on purpose). Believing he has won, Boogey turns out to be incapable of facing his worst fear, realizing that he is not at all scary (Grim actually turned the hand's power off right after he picked it up). He suffers amnesia after a series of accidents, and ends up afraid of everything. Billy also reveals that he and his friends obtained what they wanted all along without the need for Horror's Hand.

After the Underworld Court arrive to make one last attempt to banish Grim forever, Mandy insistently makes them reinstate Grim as the Grim Reaper, because he saved them from a future ruled by Boogey, but also because Numbuh 3 was too much of an optimist to actually reap anyone. In the end, a naked, cut up, future Billy appears before them to warn that if Mandy had used Horror's Hand, she would have taken over the world in two weeks, becoming the Lord of Horror from his time. Grim decides to put the hand in his trunk to ensure that that future never comes to pass. Future Billy eventually goes back to the future to make sure that things were set right.

The credits roll, showing what each character did after the events of the film, such as General Skarr using the hole in his chest to keep birds, Mandy becoming the new Captain of Boogey's ship, Numbuh 3 starting her own Reaper-for-hire service, Dracula stealing Grim's scythe for use as a golf club, Billy eventually becoming President of the United States and Boogey living in fear ever since his defeat.

The epilogue shows how Billy went back to the future to find that it hasn't changed as Fred Fredburger has obtained Horror's Hand from Grim's magic trunk and took over the world as the new Lord of Horror.

Also See

  • Grim & Evil
  • The Grim Adventures of Billy and Mandy
  • Billy & Mandy: Wrath of the Spider Queen (2007)
  • Evil Con Carne

Sound Effects Used

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Billy & Mandy's Big Boogey Adventure (2007)/Image Gallery

Audio Samples