He was voiced by Steve Blum in the English dubbed version.
Megidramon is a Mega Digimon that looks like a giant winged dragon/serpent hybrid, and razor-sharp claws and teeth. He also has armor on his shoulders, and on his chest. He has blood-red eyes.
Megidramon can wrap his enemies with his mighty tail. He can also produce acidic saliva and fire red lasers from the hazard symbol on his chest that can cause earthquakes.
Megidramon is Guilmon's dark Mega form born from Takato's rage. Takato's anger vanished, horrified of what he had done. The other Tamers were horrified at what had happened.
Megidramon seemed to have the upper hand against Beelzemon by wrapping his tail around him and attempted to devour him. However, Beelzemon seized Megidramon by his teeth and jaws and got drooled on. Megidramon then causes an earthquake with his lasers. Makuramon suddenly arrived on the scene and insults Beelzemon, thinking he was pathetic. Infuriated, Beelzemon seized Makuramon by the face, and crushed him, absorbing his data. Taomon and Rapidmon tried to stop Megidramon, only to be stopped by Makuramon’s Primal Orb attack (that Beelzemon absorbed earlier). Henry and Rika managed to quickly free their Digimon partners, allowing Beelzemon to steal their Ultimate power.
Beelzemon, having absorbed enough power, managed to regain his strength and push Megidramon back. After he fights back, Beelzemon eventually defeats Megidramon, destroying his armored chest and knocking him out cold with a kick. Takato cried, knelt down by the unconscious Megidramon and wished that he and Guilmon could start over. But as soon as Takato realized that he couldn't give up the old Guilmon, Megidramon quickly changed back into Guilmon. Takato then wished that he and Guilmon could fight Beelzemon together as it should be. This resulted in him Biomerging with Guilmon to become Gallantmon. After the battle, Takato then received a new D-Arc, an Ultimate (Golden) D-Arc. Takato was the only one in the season to get a Golden D-Arc.
- Megiddo Flame
- Dragon Howling
- Hell Howling (in X mode)
- He is second Digimon Partner to have Dark Digivolution since first Digimon Partner, SkullGreymon from Digimon Adventure/02 and third Digimon Partner, ShineGreymon Ruin Mode from Digimon Data Squad.