Marvin Stein

DC Jan 1957

Showcase #6

Showcase #6
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1st team appearance and origin of the Challengers of the Unknown: Ace Morgan, Red Ryan, Prof Haley and Rocky Davis
Created by Jack Kirby, this team is said to be a precursor to the development of the Fantastic Four
DC Mar 1957

Showcase #7

Showcase #7
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2nd team appearance of the Challengers of the Unknown
1st appearance of June Robbins, joined The Challengers
1st appearance of Ultivac, a sentient robot
DC Sep 1958

Challengers of the Unknown #3

Challengers of the Unknown #3
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Prototype of the Fantastic Four
Written and illustrated by Jack Kirby who co-created the Fantastic Four with Stan Lee three years later
In this story, one of the characters returns from space with four distinct abilities: fire projection, ice projection, size manipulation, invisibility

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