S1·E45 The Ultimate Clash

Tension runs high as a fight breaks out between Matt, Tai, and their Digimon. Kari's body is taken over a strange entity, who explains why the DigiDestined were chosen to save the Digital World. Uncertain, Matt leaves the group. Upset from the conflict, Mimi leaves as well, with Joe accompanying her. The rest of the DigiDestined continue their journey to fight the Dark Masters.