Doctor Heinz Doofenshmirtz

"This isn't the end! I invented endings!"

Doctor Heinz Doofenshmirtz (also known as Dr. Doofenshmirtz, or simply Heinz) is a scientist who formerly worked under Doctor Ivo "Eggman" Robotnik. Heinz's loyalty has fluctuated throughout the series, working on his own accord in Sonic Hedgehog 2: Eggman Strikes Back, with Doctor Nefarious in Sonic Twinsanity and even returning to Eggman's side in Sonic: Mind Over Mutant.

Early Life
Like most of the characters in the series, Heinz's age is uncertain, though a piece of Sonic Twinsanity concept art reveals that Doofenshmirtz is the same age as Eggman and Chester V. As a child, Heinz Doofenshmirtz was a classmate of Ivo "Eggman" Robotnik and Chester V. in Madame Amberly's Academy of Evil. Heinz was responsible for taking Eggman's faulty prototype Evolv-O'-Ray and refining it into a fully functional weapon. However, his lack of self-esteem allowed Doctor Eggman to take full credit for the creation.