How will they get out of the desert and make it to the diner? Grim finds out that the pants belong to Billy's dad which we now find out are immune to lasers, supernatural energies and mustard. As Season 1 is unearthed, Grim settles in to his new life above ground. In the end, Nergal turns Billy, Mandy, Grim and even the viewer thus breaking the into one before the episode ends. Meanwhile, the Delightful Children from Down the Lane and Billy accidentally fuse with the scythe's power to create the Delightful Reaper. Then, Mandy decides to make the last wish to whoever makes her the happiest. All these characters are very charismatic and original. Grim prepares him a using his granny's recipe, but this medicine makes a to start growing in Billy's back, which Billy names Yap-yap.
At the same time, two robotic replicas of Billy and Mandy are sent into the past, to stop the real Billy and Mandy from interfering with the current events. He tells about Jack voiced by , a of the old Endsville who just never knew when to stop. Soon, all the other kids want their own cards to be real too, and the city is soon under attack by a multitude of Hokey Monsters. Mandy is their only hope to defeat the Reaper, but instead she fuses with the Reaper. Instead of using the apple, Billy becomes distracted with his own idiotic errands, leading Eris to go insane.
With the help of Pud'n and Mindy, Grim tries to get his scythe back. In the end, Grim assures the kids that Gladys has won the battle but not the war. The Delightful Reaper assimilates nearly all of Endsville including Number 2 and grows more powerful. Billy decides to be Junior's friend, but he is scared away at the moment Junior shows him his true form. In the end, Billy, Mandy, and Grim return home escaping from a giant , while Irwin remains trapped. Later, Mandy and Grim get pulled in as well. Billy and Mandy get a lesson on possession, Grim lands a part-time job as a swimsuit model and Mandy is forced to move in with Billy after a stink bomb explodes in her house.
At the same time, Billy mistakes Gregory for Grim and he and Mandy take him with them. He defeats Mandy at a contest in which Mandy decided not to participate, but he does not need to go to the bathroom anymore. The segments were spun-out into their own series on June 13, 2003, and continued to air until November 9, 2007. Grim decides to fulfill his dream by working as a model, but, as he is a , he is not hired. Eventually, Yap-yap, now looking like a smaller version of Billy, detaches himself from Billy which would have technically cured Billy without the need of him drinking the anitdote , and tries to escape from the antidote. With both still alive, Mandy still demands the prize money, which she uses to buy Hector Con Carne's Bunny. Doolin and Mandy scare him away by posing as ghosts.
Grim seems to be having a good time, acting like a silly kid, while Billy is bored waiting for his old victim, Mr. When the nuns realize the truth about Grim they get angry at him, but also help him go back home by sending him flying away with another punch. She tricks Mandy into opening it so that Mindy can be destroyed and now demons that look like food are unleashed upon humanity. She mutates all the chocolate bar soldiers in to monsters with a spell and plans to rain terror over the trick-or-treaters of the world. Grim's skull is connected to a projection screen, and the story on how he became the Reaper is shown. Billy's dad takes off the pants, and the Samurai Skeleton destroys the Reaper, freeing all of the assimilated children inside it.
Billy-Irwin, and Mandy-Grim compete against Mindy, Sperg, and a mystery racer Pud'n. It turns out Kuan Ti is actually Eris in disguise, and this was just another of her schemes to create chaos. Looks like you're just gonna have to grim and bear it. Most things are peaceful except a rude unicorn named Mary Frances. Mandy dares to go inside to retrieve the dice, and she befriends Mrs. In any way, the loser is trying to regain its former power and get rid of their carefree owners.
In the end, Yap-yap drinks the antidote and is destroyed. She takes Mandy under her wing while Grim pines over his unrequited love for Eris. It is revealed that an was held in the Underworld's high school to choose the Reaper, in which students had to vote on the scariest participant. Note: This is the first appearance of Nergal. Looking for proof, Billy and Grim find figures and arrangements for a celebration in Mandy's backyard. However, Mandy then says that when she said it was Opposite Day, it really was not. The grim reaper Grim is bound to serve the pair after loosing to them in a bet.
The unlikely pair have a common bond; the two share control of the grim reaper himself. Giant Billy and Mandy All-Out Attack: Grim transports Billy and Irwin to mystical Japan and there they watch giant monsters fight. Milkshakes, Billy's cat, eats the worm instead, and is forced to tutor Billy. Mandy gives false information to a of Billy to capture the members of a resistance that try to defeat her. However, Eris is not interested in the skinless Grim, but in the muscular Adonis.
Grim is found guilty, is stripped of his rank and magical scythe, and he, Billy, Mandy, and Irwin are sentenced to be exiled. They beat the cunning death in some incomprehensible way. In the end, Gladys ends up going living with Billy's aunt, to try and calm herself down. The monster tries to defeat him meanwhile Mandy reads a letter from Billy and goes to mystical Japan to beat up the cat monster and Billy. Mandy is soon in control of the only remaining wish, with Grim and Billy desperately trying to curry favor. The Grim Reaper transports the kids to , where he challenges them to a game of.