Lead scientist who develops a highly efficient plutonium refining process, leading to a covert government laboratory. He becomes personally involved when a teenage boy steals his material to build a nuclear device. John attempts to negotiate the bomb's surrender, helps the team dismantle it under extreme pressure, and ultimately exposes the facility to the public to prevent Paul's arrest.
John invites Jenny's boyfriend Paul to tour the lab, inadvertently providing the environment that sparks Jenny's investigative journalism.
John attempts to win the affections of the single mother Elizabeth while searching for an apartment in Ithaca.
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