Billy & Mandy's Big Boogey Adventure is a 2007 made-for-televisionanimated adventure fantasy comedy film produced by Cartoon Network Studios, and is the first made-for-television film based on the animated series The Grim Adventures of Billy & Mandy, the second being Billy & Mandy: Wrath of the Spider Queen. Big Boogey Adventure premiered in the United States on March 30, 2007, and in the UK on February 14, 2007, and was released on DVD in the U.S. on April 3, 2007. The events of the film take place during the sixth and final season of The Grim Adventures of Billy & Mandy.
Plot[]
In the future, in a dystopian Endsville, an evil being known as the "Lord of Horror" orders robotic duplicates, Billybot and Mandroid, to go back in time to eliminate Billy and Mandy and prevent them from reaching a powerful hand-like artifact in the Lord of Horror's possession before his past self does. 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 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 becoming his court-appointedreplacement. 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 once again. The group eventually escapes and plans to obtain the hand for themselves for various reasons. Both groups eventually reach where the hand is held, where they meet Horror the Ancient, a living statue and source of the Hand, having channeled his fears within it and cutting it off in an attempt to make himself brave. To obtain the hand, the 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, leaving Grim to claim the hand unaffected, revealing he goes through his worst nightmare every day — being forced to live with Billy and Mandy. The hand however is almost immediately stolen by Boogey. 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, meaning Boogey wasn't ever scary at all). He suffers amnesia after a series of accidents and ends up afraid of everything. Mistaking Fred Fredburger's comments about nachos for actual philosophical advice, Billy has an epiphany that he and his friends obtained what they wanted without the need for Horror's Hand. After the Underworld Court arrive to finish Boogey's business of banishing Grim forever, Mandy makes them reinstate Grim as the Grim Reaper because he saved the world from a future ruled by Boogey, but also because Numbuh 3 was too much of an optimist to actually reap anyone in the court's view. In the end, Billy from the future 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 show 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 (which results the people laughing at her), Dracula stealing Grim's scythe for use as a golf club, Irwin being bedridden for getting infected with mono and cooties after kissing Mandy, 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 has not 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, having conquered his fear of running out of nachos.