Chairman Drek, aka Ultimate Supreme Executive Chairman Drek, was a manaical leader of a bunch of turnip-heads. Nobody knows how or why he came to be the leader, since he seems to be completely insane. He concocted a scheme to make a lot of money by building a new planet for his people after their old one was overrun by pollution (actually caused by Drek himself).
Drek would receive huge payoffs if he built this new planet so he went around extrancting sectors of other planets and causing them to explode. Fortunatly, the remaining planets on his list were saved by Ratchet and Clank who went in and blew him up. His artificial planet was destroyed in the process.