Challengers of the Unknown #43
In "Four Against Monstro," the Challengers of the Unknown face their most bizarre threat yet when a harpy steals a mysterious sarcophagus, leading them to Skull Island and a hidden lab of long-extinct creatures. Written by Bill Finger and illustrated by Bob Brown, this 1965 issue delivers a classic sci-fi twist as the team awakens in new uniforms with hourglass emblems, confronted by a council of radiation-mutated scientists. Cover by Bob Brown, the story unfolds with eerie suspense and surprising turns—without revealing how the Challs survive the island’s final explosion.
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The Challs guard a recently unearthed sarcophagus but a harpy creature breaks in and steals it. Arriving at Skull Island the heroes find an underground lab of extinct creatures. They fight back but are gassed. They awaken in new uniforms with hourglass emblems facing a council of scientists mutated by radiation. The Challs are asked to mutate but refuse; in order to free his friends Prof subjects himself to the transformation. His mind is affected and he attacks the Challs. When the transformer blows up Prof reverts to normal. The explosion destroys the island as the team escape in their jet.
Plot details indexed by the Grand Comics Database (CC BY-SA).