Fantastic Four (1961) #20

1st appearance & origin of Molecule Man (Owen Reece)

"The Mysterious Molecule Man!"

While working on a dangerous atomic device, Owen Reece is caught in an accidental explosion. Due to a trillion to one chance he survives, and gains the ability to control molecules. After gaining these powers he does what any good laboratory technician would do, he tries to conquer the world. The Fantastic Four, who have been warned of this danger by the Watcher, defeat the Molecule Man with a little help from Alicia Masters.