The Question first appeared in DC Comics in the pages of Crisis #5, after a deal had been arranged with Watchmen writer Alan Moore so that Charlton's heroes could be spared the fate the Watchmen would have given them.

""This Earth has only recently come within the bounds of the DC comics Multiverse; prior to 1985, its heroes were the property of Charlton Comics. Their most famous crusaders were Captain Atom, the Blue Beetle, Nightshade, Thunderbolt, Son of Vulcan, the Question, and the Peacemaker, all of whom originated in the 1960s."

"When Captain Nathaniel Christopher Adam became Captain Atom in 1961, he ushered in the new age of heroes on Earth-Four. He was followed some three years later by Earth Four's first Blue Beetle, Dan Garrett, an archaeologist who gained super powers from a mystic blue scarab. They were joined within three years by the Son of Vulcan, an American who was endowed with the might of the Olympian gods; by Thunderbolt, who had been trained by Tibetan monks to harness the energy of his entire brain to perform amazing feats; the new Blue Beetle, who lacked super powers but followed in the footsteps of the dead Dan Garrett; the Sentinels, a trio of youths who were given super abilities by special devices; the Peacemaker, a diplomat who devised weaponry to be used against the perpetrators of war, the Fightin' Five, a team of specialists who fought would be world conquerors; the Question, a crusading reporter who ferreted out facts by assuming a faceless identity; and the lesser known Shape, Tyro Team, and Spookman, all of whom had only one adventure apiece depicted in Charlton Comics. Nightshade, the daughter of a United States Senator and an other dimensional princess, had the power to become a living shadow, besides her considerable martial arts expertise, and became first the partner of Captain Atom and then a solo heroine in her own right."

From The Captain's Justice League Homepage