Omnimon (Tamers)

In "Battle of Adventurers", Omnimon is seen chasing an Apocalymon that reformats itself into Mephistomon, until the foe escapes from his pursuit. When Takato, Growlmon, Kai and Seasermon battle Mephistomon's Digimon minions, he brings in Henry, Rika, Gargomon and Kyubimon to help, guiding them through the dimension he guards and destroying several evil Digimon. He deposits the group where the others are and Mephistomon has revealed himself calling them DigiDestined and telling them he can't help anymore as he can't leave his dimension. The group succeds in destroying Mephistomon (digivolved to Gulfmon) and ending his plans.