Jonathan Kent is the adoptive father of Clark Kent (Kal-El), a.k.a. Superman.
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History
EARTH ONE PRE-CRISIS FIRST APPEARANCE: More Fun Comics #101 (January, 1945)
EARTH ONE PRE-CRISIS DEATH APPEARANCE: Superman #363 (September, 1981)
POST-CRISIS FIRST APPEARANCE: The Man of Steel #1 (October, 1986)
POST-CRISIS DEATH APPEARANCE: Action Comics #870 (December, 2008)