After Puppetmon was defeated, the Digidestined wandered into Machinedramon's territory along a road in the middle of nowhere, until Kari developed a fever and kept passing-out, making Tai upset since this brings memories from his child-hood past with Kari. In his first appearance with the other Dark Masters, he unexpectedly attacked Angemon and then attacked the 7 Ultimate Level Digimon before they could attack him and defeated them.
In Digimon Fusion, Machinedramon has a purple choker presumably to tell he's Lilithmon's pet, and doesn't contain the dual cannons on his back. In Digimon Fusion, Machinedramon's appearance is slightly altered. Machinedramon is a Mega Level Digimon that resembles a mechanical Dragon. 3 Digimon Adventure: Anode/Cathode Tamer.He is also the main antagonist's most powerful slave Digimon in Digimon World and the final boss of said game. He can also be considered responsible for Ken Ichijoji's transformation into the Digimon Emperor. Machinedramon was the ruler of the Digital City, which looked like a fusion of the prominent cities on Earth. During the time the DigiDestined were fighting Myotismon in Tokyo, Machinedramon had taken to ruling over the city portion of Spiral Mountain. It was the second biggest of the Dark Masters and is the Dark Master who was defeated by the Digidestined the quickest (2 episodes) in the English version, while in the Japanese version it appeared in as many episodes as MetalSeadramon. It has appeared as an antagonist on several occasions in different Digimon media. This is because it posseses parts of other ones, namely Megadramon, MetalTyrannomon, MetalMamemon, MetalGreymon and Andromon. Machinedramon (known as Mugendramon in the Japanese version) is a Virus type Mega Level Digimon that is hypothesized to be the ultimate "Dramon" and Cyber Digimon in general.
"Oh, good, just what I was looking for: victims!"