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Micah Flint had been LexCorp’s top test pilot before he volunteered as a test subject in his boss’s deep space exploration program, aimed at bio-engineering astronauts to better survive the rigours of space travel and the hostile environments of other worlds. But Luthor’s impatience with the program’s progress led to relaxed experimental standards. An explosion levelled the project facility, and those lost to the blast were written off as dead. |
Flint had survived, transformed into a massive rock like being. Over the course of many months, he dug his way out of the rubble and headed for Metropolis, desiring revenge on Lex Luthor. |
After Superman thwarted his attempt, the Rock joined the Superman Revenge Squad. |