Digimon Adventure 02: Revenge of Diaboromon, originally released in Japan as Digimon Adventure 02: Diablomon Strikes Back, is the fourth Digimon film. It was released in Japan on March 3, 2001, later released in the United States on August 5, 2005. Taking place three months after MaloMyotismon's defeat, the DigiDestined go up against Diaboromon again. Tai and Matt head back to the Internet to deal with him with Omnimon, while the younger Chosen Children go to deal with the rampage of a swarm of Kuramon (Diaboromon's Fresh form). With the help of Angemon and Angewomon (with T.K. and Kari), Omnimon was able to destroy Diaboromon again, but it turned out to be a trap, as his destruction allowed many more Kuramon to go to the Real World. Things go out of control when the Kuramon in the Real World merge to create a Mega level called Armageddemon, an alternate Mega in Diaboromon's evolutionary line. It is so powerful that neither Omnimon nor Imperialdramon were able to defeat it on their own. In the end, Omnimon gives his energy to Imperialdramon Fighter Mode, powering him up to Paladin Mode. Using his Omni Sword attack, Imperialdramon is able to strike down Armageddemon, splitting him back up into the Kuramon. With the help of the energy from the DigiDestined Digivices and the cell phones from the other kids of Japan, the Omni Sword is powered up, allowing all of the Kuramon to be destroyed for good.

Along with One Piece: Clockwork Island Adventure, the fourth Digimon film was shown as a double feature, which was called the Tōei Spring Anime Fair 2001. In total, they earned 3,000,000,000 Japanese yen.