Alternate reality
Johnny was a childhood friend of James Kirk living in Iowa in the 2240s.
Kirk drove past Johnny on a dirt road, after stealing his own stepfather's Corvette, in an act of rebellion. (Star Trek)
Johnny was played by Spencer Daniels, who was cast as Kirk's older brother, George Samuel Kirk (scripted to be shown as a "14 year-old"). [1] However, when all of Daniels' other scenes were removed, the character of George was essentially eliminated, and Kirk was overdubbed when he saw "George" in his joyride, referring to him instead as "Johnny".