Digimon Data Squad - Season 1 Episode 3 The Return of Thomas!

At the Damon household, everyone is preparing themselves for the day ahead when Marcus receives a call from DATS that a DemiMeramon has begun attacking some men who. However, due to DemiMeramon's lack of body mass, neither Agumon nor Marcus could do any damage which makes the latter unable to activate his DNA. As the two run off after DemiMeramon after he flew off, a blond-haired youth arrives and wipes men's memories of the attack before going after the wild Digimon. A while later, unable to find DemiMeramon, Marcus learns the wild Digimon was captured by the blond-haired youth who is identified as the child genius Thomas H. Norstein who has returned after six months of being at DATS's Austria branch. Because of their different personalities, Marcus and Thomas get on each other's bad side as they end up having a boxing match before learning that DemiMeramon spawned from original's flame sparks are attacking the city. Sent by Commander Sampson to battle the DemiMeramon, Thomas has his partner Gaomon digivolve into Gaogamon to defeat them. However, three DemiMeramon remain at a chemical plant close to DATS. Starting to suffer self doubt after seeing Thomas and Gaomon fight, Marcus runs off before finds the old fisherman cooking a fish on a makeshift stove, the man's speech of fanning flames giving Marcus an idea. Confronting the DemiMeranon, Marcus has Agumon use his fire to strengthen them until they combined and digivolve into Meramon. Marcus, now having an opposite he can hit, is then able to punch Meramon and has GeoGreymon finish the wild Digimon off. Later, to both their dismay, Marcus learns that he and Thomas are to be teamed up.