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Clifford DeVoe is a villain of Jay Garrick, the original Flash, who uses a thinking cap to enhance his intellect.
The Thinker (Clifford DeVoe)
1943
for 1943 in Comic Characters by Debut Year
Suggested by emeraldshinigami
This is going off the debut of comic book characters. In the cases of characters who were introduced in other media originally and added to the comics canon later along (ex: Harley Quinn) it'll go by actual debut year.
