Robert Grayson is the 1950s Marvel Boy, debuting in Marvel Boy #1 (in December 1950), from Marvel Comics 1950s forerunner, Atlas Comics. He continued to appear when the series title was changed to Astonishing with issue #3. Created by writer-editor Stan Lee and artist Russ Heath, with writer-artist Bill Everett taking over with Astonishing #2, this Marvel Boy is the son of Dr. Horace Grabshield (later anglicized as Grayson), a scientist who fled Earth with his infant during the rise of Nazi Germany. The Graysons landed on Uranus, where they were greeted by the native Uranian Eternals. They presented Robert Grayson with a costume and a pair of powerful bracelets that he used to battle crime on Earth. His final story was in Astonishing #7 (in December 1951).

Astonishing #3-63 continued from super-hero title Marvel Boy.