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Description
While excavating near Mt. Rushmore, Jack Bradley, a construction worker, was caught in an explosion and then an avalanche, covering him in a mysterious dust. Later, he discovered that he could transform into flint whenever he became angry. His powers while in this state include superhuman strength and invulnerability. His powers also automatically activate upon coming into contact with metal, but they wear off after a short while unless he touches metal again.
He discovered the explosion was caused by two Pacific islanders under the orders of Lava Man. Jack decided to head to the South Seas to investigate, but the motor of his boat died leaving him stranded and under attack from hostile natives. Jack transformed into Fearless Flint and defeated them easily. He escaped and finds Lewis Stanley who along with his comrades were stranded and need Jack's help to escape. Just then Lava Man tells the natives to burn all the white men's huts. Jack Bradley rushed to the aid of June and her father John Anderson who were under attack.

Description
While excavating near Mt. Rushmore, Jack Bradley, a construction worker, was caught in an explosion and then an avalanche, covering him in a mysterious dust. Later, he discovered that he could transform into flint whenever he became angry. His powers while in this state include superhuman strength and invulnerability. His powers also automatically activate upon coming into contact with metal, but they wear off after a short while unless he touches metal again.
He discovered the explosion was caused by two Pacific islanders under the orders of Lava Man. Jack decided to head to the South Seas to investigate, but the motor of his boat died leaving him stranded and under attack from hostile natives. Jack transformed into Fearless Flint and defeated them easily. He escaped and finds Lewis Stanley who along with his comrades were stranded and need Jack's help to escape. Just then Lava Man tells the natives to burn all the white men's huts. Jack Bradley rushed to the aid of June and her father John Anderson who were under attack.