Digimon Adventure V-Tamer 01

Based on the original Digimon V-pets, V-Tamer certainly brings a whole new twist on the world of Digimon. It opens with Taichi, the main character of the series, attempting to enter a tournment with his V-pet, only to be disqualified because the monster on his V-pet cannot be identified and therefore was not a Digimon that was supposed to be programmed into the V-pet.