Underfist: Halloween Bash (otherwise known as Underfist) is an American animated spin-off special of The Grim Adventures of Billy & Mandy. It originally aired on Cartoon Network on October 12, 2008. The special was going to be the setup for a new series spin-off of Grim & Evil, but Maxwell Atoms's contract with Cartoon Network expired before he moved to Disney Channel for the TV series Fish Hooks, and the special was ultimately the finale of the Grim & Evil franchise.
Plot[]
On Halloween night, Irwin, Billy, Mandy, and Grim are trick-or-treating, Billy is a witch, Mandy and Grim are the Spanish Inquisition who burn witches and vampires, and Irwin is Dracula, king of the vampires. Billy, Mandy, and Grim decide to go home after having no success with Dracula, who rudely hands them pennies. Irwin realizes that his life is passing him by. A girl, Mindy, (secretly turned into a witch by an evil marshmallow bunny named Mr. Bun Bun) fools Irwin into opening an underworld portal, releasing an army of evil candy warriors who start terrorizing the neighborhood. Irwin gets attacked and contacts Hoss Delgado, who helps him with the battle. The warriors take down Hoss with soda-candy guns, which if Hoss gets sticky, he gets a rash. When they kill Skarr's winning purple pansies, he comes out of his garage with a robot, joining the battle. Soon it's an all out war, with no mercy, no rules, no nothing. Mindy again tricks Irwin, but this time, pretending she is being kidnapped by Mr. Bun Bun, taking her into the Underworld. When the candy level gets too high, Hoss clicks his car unlock system, and a giant saw car drills out of the ground. They escape and start to plot their attack to the Underworld. Soon they find a portal to the Underworld in the rain, which Hoss and Irwin jump in first, but the portal turns off, because Mindy destroyed the diamond powering it. The candy warriors try to sacrifice Hoss by pushing him into hot cocoa, but they want to leave Irwin alive. This is because he has the powers of a mummy, being half mummy from his mother, which they need to keep the balance of the Underworld in place, and to become stronger warriors to eat the trick-or-treaters. Mindy creates a potion which turns all the warriors into monsters, and all she needs now is Irwin's powers to create the candy warriors ultimate monster form. But Irwin refuses. Soon Jeff the Spider, Fred Fredburger, and Skarr find out a way how to get to the Underworld by using Hoss's car to drill into the Underworld, and they rescue Irwin and Hoss. But the army of candy monsters hasn't given up yet. They head to the city and attack. Irwin and Hoss get into an argument, leading into a battle, turning on each other. While the battle is going on, the monsters suck up Irwin's power and transform into one giant candy monster. Jeff and Fred try to escape, but they fail. Soon Hoss and Irwin see the monster and start to fight it, beating it. Irwin discovers that Hoss is scared of monsters, because he was haunted as a kid. In a rare moment of emotion, Hoss apologizes to Irwin for how he treated him and realizes there are good monsters out there. Mindy also realizes what she did was wrong and apologizes as well. Just then, Mr. Bun Bun and Skarr (who is secretly working for him) appears and admits that he was the one who turned Mindy into a witch using a Witch Worm and used her to get to Irwin so he could use his powers to open up portals to the Underworld. He also reveals that he cut off Fred's tusks, made Billy scared of spiders, and haunted Hoss's childhood. Just as Bun Bun is about to kill Mindy and Underfist, Skarr betrays Bun Bun and kicks him into hot cocoa, melting the marshmallow bunny. Grim, Billy, and Mandy (who became president) award Underfist for saving Halloween, but then they hear something outside and investigate. It's soon revealed that there is an army of squid warriors who have found their way to the surface world that the team made while trying to escape from the Underworld.