FORGET ABOUT IT
(Episode 22)

Tai and Agumon return to the DigiWorld, where they look for their friends.  They find Tokomon, who tells them that the other kids split up to look for them. 

He and T.K. met up with a new Digimon, Demidevimon, who seemed to be a friend but caused the two to have an angry fight and go their separate ways.  

Tai, Agumon and Tokomon find T.K. and Demidevimon, and Tai tries to get T.K. and Tokomon to make up.  Demidevimon senses he's losing his influence over T.K. and tries to get the others to eat some mushrooms of forgetfulness, but they're warned off by a mysterious female voice (Sora). 

Realizing that Demidevimon isn't a true friend, Tokomon digivolves to Patamon and drives him off.