Hyleg Ourobockle (ヒューレッグ・ウロボックル Hyūreggu Urobokkuru?) is one of the bosses of Mega Man Zero 2. Ourobockle is based on the Ouroboros snake, and was a member of Phantom's Zan'ei Army. Zero fights against him atop a giant snake Mechaniloid called Altoloid (アルトロイド Arutoroido?), and recovers one of the Baby Elves after his defeat, prompting X to appear and warn Zero about the Baby Elves.