Baxter Stockman (Mirage)

Baxter Stockman is a knowledgeable African American scientist "off in his own world" that used his talents for his own selfish nefarious schemes rather than to help mankind. His latest invention, the Mousers, were small robots designed to find and kill rats, thus solving the city's rat problem. However, Baxter was really using the Mousers to rob banks and commit other crimes not because of the money (he could use his invention to make millions legally), but because "it was FUN!". When his assistant April O'Neil questioned Stockman, he led April to an underground factory where hundreds of Mousers were being made. Once his assistant April O'Neil discovered his plan, he sent the Mousers after her. April tried to escape through the elevator, but the scientist sent the elevator to sewer level. The Teenage Mutant Ninja Turtles saved her from the Mousers that Stockman had sent to kill April. Not knowing that she was saved by the TMNT, he continued his plans, holding the city ransom with the threat of destroying several city landmarks with his Mousers. With the help of April, the TMNT found Baxter, defeated him, and sent him to jail.

In Volume 2 of the series, Baxter would somehow escape prison and break into the DARPA facility to wreak havok. After taking out the guards, he would somehow implant his brain into the body of a huge killer robot making him a cyborg. As the robot, Baxter would bust out of DARPA, seek out and find April O'Neil and inject her with something which was, at the time, unrevealed. The TMNT, Casey and Nobody find and battle it out with the Baxterbot, which would result in Baxter escaping missing an arm and blacking out, and Raphael being captured by DARPA. Gaining consciousness, Baxter would discover his robot body was fixed and somehow regenerated an arm. The other three Turtles and Casey find the Baxterbot in the sewers, ready to electrocute them with live power lines. Leo would turn the tables and electrocute the Baxterbot instead. While the Turtles wondered how Baxter got the robot to work, they didn't know his brain was actually inside it. Or so it would seem. Assumed to be destroyed; only the glasses he had retrieved earlier remained.

In Volume 4 of the series, April would fall prey to nanobots inside her system, threatening her life. It was revealed that this was what Baxter injected her shoulder with all those years ago. It was also revealed that Donatello had part of the robot with Baxter's brain still alive and pinned up against a sewer wall hidden from his brothers for years. When Donatello would ask Baxter for a way to help April, the mad scientist would only laugh and say how she was doomed. In a rage, Donatello blew him up, including his mind, to avenge April. The Nanobots were destroyed but are suspected to have made her sterile