Digimon Adventure

Tai manages to rescue Sora. Datamon pulls himself, Etemon, and many of Etemon's minions directly into the Dark Network. When Etemon reappears, having fused with the network, Greymon digivolves into MetalGreymon to fight him. The battle ends up opening a portal that sucks away Etemon and transports both Tai and Agumon back to Tokyo.