Digimon Tamers (2001)

S1E4 It Came from the Other Side

Gargomon reverts back to Terriermon, prompting Henry to reflect on the idea of destroying real Digimon after his conversation with Rika. He reminisces about the day he received his digivice. The following day, they find themselves battling Gorillamon, a Digimon that haunts Henry’s nightmares. Despite the danger, Henry decides against allowing Terriermon to digivolve, forcing him and Guilmon to confront the stronger Digimon as they are. Ultimately, they manage to subdue Gorillamon with a card that binds him, but he rises once more. In a decisive moment, Terriermon fires into his cannon as it charges, defeating him, though Henry stops him from absorbing Gorillamon’s data.