Where Monsters Dwell #20
In "Klagg! His Mission: Destroy Mankind!", a disgruntled inventor flees his scheming boss by activating a time machine—only to crash-land in a prehistoric world where modern power sources are nowhere to be found. Written by Stan Lee and Larry Lieber, with dynamic art by Dick Ayers and lettering by Joe Letterese, this 1973 Marvel classic blends sci-fi suspense with a timeless underdog tale. The cover by Jim Starlin and Frank Giacoia captures the eerie tension of a man out of time, stranded where the past is still very much alive.
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A brilliant inventor's boss tries to steal his new time machine in order to take credit for it. He uses the time machine to travel to a different time, but ends up in the prehistoric period, where the electricity to power the time machine cannot be found.
Plot details indexed by the Grand Comics Database (CC BY-SA).