As the Fusion Fighters meet the Monitamon of the Warrior Zone and their Monitamon Elder, who have been following their exploits through the Monitamon under Nene, they learn that Blastmon's general Musyamon has taken over most of the Warrior Zone. They visit a Monitamon training camp where they watch Monitamon more or less fail at training, and they learn that the Zone's princess has been taken hostage by Musyamon, who wants the Code Crown in exchange. Just then, a Shurimon arrives and tries to attack the Monitamon Elder but is stopped by Sparrowmon and leaves in exchange for a bribe. After trickily getting everyone up a cliff, Jeremy falls off but is saved by a group of Etemons. They then head to the lair of Karatenmon who will only give up the Code Crown if someone can make him laugh. Everyone tries their best, from telling jokes to forming humorous DigiFuses, to no success. However, Nene, who has lightened up a bit more, joins Angie in a comedy sketch which successfully makes Karatenmon laugh. When he reveals the Code Crown, the Etemons snatch it, revealing themselves as spies under Musyamon. Mikey digifuses Ballistamon and Beastmon into BalliBeastmon to seduce the Etemons before hitting them with a surprise attack and finishing them with the Star Sword. Nene and Angie become friends and the Fusion Fighters regain the Code Crown to rescue the princess.
(Numbers indicate order of appearance. Bolded characters are fought by the protagonist(s), and italicized characters feature non-explicitly, e.g. voice, silhouette, image.)
SkullGreymon Type: Virus Special Moves Cursed Breath
Mikey: "SkullGreymon. His attacks include Cursed Breath, which must smell a lot like Shoutmon after a burger with extra onions. With all SkullGreymon's done, he has a bunch of skeletons in his closet. In fact, his closet is made of skeletons!" Monitamon: "Boy, it's cold outside, and that's snow joke. Ha!"
SkullGreymon Type: Undead Special Moves Ground Zero