Yeah. There are evil digimon just like there's good digimon. At one point, a gate was opened from the digital world to go to earth because...there were supposed to be eight of us. When we first got there, only seven of us had made it. So a digimon called Vamdemon found a way to Earth to try and find the eighth child and kill them. If we weren't all together, we wouldn't have been at our strongest.