Action Comics No. 525, marking Neutron's first appearance.
An enormously powerful villain who was once a criminal henchman named Nathaniel Tryon. Along with his fellow crooks Ted Grand and Tim Moore, Tryon was once part of a team of hoods called the TNT Trio, who were employed by
Lex Luthor. While performing a job for the criminal mastermind that involved sabotaging a nuclear power plant, Tryon became trapped by falling lead shielding, which nearly crushed him to death. The reactor's meltdown was halted by
Superman, who also apprehended Grand and Moore. The two hoods insisted that they operated alone, and as Superman's X-ray vision cannot penetrate lead, the Man of Steel inadvertantly missed the imperiled Tryon.
