M11 is first seen working for the Futurians, and he is used to spy on the Japanese army in 1944 on Lagos Island, where he witnesses the Godzillasaurus 'defending' the Japanese against a group of American soldiers. After Emmy sides with the humans, M11 is sent to capture her, and gets partially damaged in the process, having the artificial skin on the right side of his face burnt off in a car fire, but he keeps going until he corners Emmy and Terasawa. After returning to MOTHER, he is repaired, then Emmy reprograms him so he would listen to her commands, but still keep his fighting capabilities. M11 helps with the takeover of MOTHER and it's destruction, and it goes to the future with Emmy. His Brain is programmed inside of Mecha-King Ghidorah, and he helps with the battle against Godzilla. When Mecha-King Ghidorah fell into the Ocean, M11 was still part of the controls, and thus seemed to have died in the wreck. However, as Emmy prepares to leave and go to the future, M11's brain is included in KIDS' controls, suggesting that at least some of his systems survived.
M11 is extremely durable and agile, and displays a great degree of strength when he was easily able to lift Terasawa's Jeep and rip off its doors, as well as catch up to it on foot. Humorously, he is also seen clearly being able to maintain control of a car, despite not actually steering it - most likely due to a continuity error. He has extraordinary intelligence, and he can run at an extremely fast speed which makes him able to avoid bullets. Like Emmy, he is an excellent pilot, and knows how to pilot KIDS. He is an excellent sharp-shooter, and appears to be far stronger than the other Androids aboard MOTHER, easily destroying them with his blaster gun or simply knocking them out with punches and kicks.