From mskouloudis @ ProjectW

Challengers Of the Unknown (1-6)
Howie Chaykin

from Wikipedia: http://en.wikipedia.org/wiki/Challengers_of_the_Unknown

The Challengers of the Unknown is a group of fictional characters first drawn by Jack Kirby for DC Comics. This quartet of adventurers explored science fictional and apparent paranormal occurrences and faced fantastic menaces. The group debuted in Showcase #6 (February 1957) as acquaintances who miraculously survived a plane crash unscathed. They concluded that since they were “living on borrowed time”, they should band together for hazardous adventures. The four — Kyle “Ace” Morgan, Matthew “Red” Ryan, Leslie “Rocky” Davis, and Walter Mark “Prof” Haley — became the Challengers of the Unknown.

One more revamp was Howard Chaykin’s Volume 4 miniseries (2004-2005) of 6 isses. On a world without superheroes, five troublemakers - a blogger, hip hop artist, eco-terrorist, etc. - discovered they’d been genetically enhanced and chip-programmed to be soldier-pawns. The villains are the Hegemony, a cabal of billionaires who secretly ran the world. Made slaves on a Moon base, three Challengers blew up the base, escaped to Earth, and declared war on the Hegemony until (like the obliquely-mentioned earlier Challengers) their “borrowed time” runs out.

This has been collected in trade paperback: Challengers of the Unknown: Stolen Moments, Borrowed Time.

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