Personal Info:
Real Name: Arnold Sutton
Also Known As: No known Alias
Place Of Birth: Earth-712
First Appearance: Avengers Vol.1 #86 (1971) Silver Age Villain
Known Associates: No known Associates
Group Affiliation: None
Base Of Operations: The Dark Tower, Earth-712
Grudges: Avengers and Squadron Supreme
Creators: Roy Thomas and John Buscema
Superhuman Intelligence: Brain-Child possesses superhuman intelligence, granting him advanced reasoning, mathematical abilities, etc., along with total recall. He is capable of constructing advanced weaponry and other forms of technology.
Mental Powers: Brain-Child can form various creatures and machinery from his mind, and animate them. Whether he was forming illusions, or whether he was actually generating (or summoning) solid matter or energy forms is unclear (and moot), but his creations vanished when he was not able to concentrate on them. His entire base, the Dark Tower, and all that was in it were created by his mind.
Arnold was the mutant child of Harold Sutton and his wife, two people exposed to high-levels of radiation. His superior intelligence was apparent by the time he was one year old. By nine, he was a scientist working for the military, but physically hideous due to his oversized brain and seen as a freak. When he was ten, he refused to work unless he could have his own island, which he got. Angry at how people used him for his mind, but avoided him as a person, he decided to destroy the world. He built a special rocket designed to be fired into the sun, causing it to go supernova, but he tricked everyone into thinking it was going to be a regular probe.
The Avengers, visiting from Earth-616, were forewarned of the event by having travelled a week into the future. They convinced Nighthawk to help them stop the launch
Brain-Child at Marvel Database
Brain-Child at Marvel Universe: The Appendix