Often considered — erroneously in my opinion — to be a precursor to the Fantastic Four, the Challengers of the Unknown were a bunch of guys who were fortunate enough to survive a plane crash. Realising they were living on borrowed time, Ace Morgan, Prof Haley, Red Ryan and Rocky Davis determined that from that day forward they should stay together to investigate weird happenings and generally get involved in fantastic scrapes. As you would.

The last creation of the Joe Simon/Jack Kirby team (Simon departed before the concept was sold to DC), the Challengers debuted in Showcase #6, and went on to enjoy a very respectable run in their own series into the 1970s.

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