Dr. Zagart is behind practically everything in the second season. He knows what he wants, and how to get it too. What he wants is his son back. His real son died a few years ago and, in his grief, he made an android that looked exactly like him, called Zeo.
Dr. Zagart has a few issues though. He thinks that if he can get the sacred Bit-beasts power (Dranzer, Driger, Draciel, and Dragoon) and transfer it into Zeo's circuts, he can turn Zeo into a real boy. Great sentiment and all, but that doesn't happen in real life. He convinces Zeo that he can be turned into a real boy by this crazy plan, though, and all he has to do is leave Tyson and the BladeBreakers, and steal their Bit-Beasts.