Alpha One

Alpha One was the most intelligent robotic soldier of the Shredder and the Foot Clan. The Shredder built Alpha One to replace Bebop and Rocksteady's incompetence. Eventuallly, Alpha became so competent that he eventually took over the Clan and betrayed Shredder and Krang. After his first conflict with the turtles, he was drifted out of space to not be seen.