Johnny 13 first appeared in "13," when he and his girlfriend Kitty attempted to escape the Ghost Zone. Kitty was unable to maintain her form in the real world after the portal door closed on her hair and needed someone to wear her clothes (a jacket, scarf and ring imbued with her essence) so that she would be able to reform around them and switch places. Unfortunately, Johnny picked Jazz Fenton to be his girlfriend's host. He nearly succeeds, but Danny was able to stop the body transfer by pulling the ring off his sister's finger at the last minute. Johnny is captured and sent back through the portal.
In "Lucky in Love," Johnny steals a device from the Fentons that generates a ghost portal and modifies it into his bike. He then escapes back to Amity Park taking Kitty with him. However Johnny's leering at other girls led Kitty to abandon him, overshadow Paulina, and pretend to be in love with Danny so Johnny would feel jealous. When Danny finds out, he asks Johnny to stage a battle with him, which the latter intentionally loses. Kitty gets angry at Danny for hurting Johnny and helps him, with the ghostly couple later returning to the Ghost Zone. Danny destroys the device Johnny put into his bike, which causes him to mention their deal and Kitty to become angry all over again.
In "The Ultimate Enemy," an alternate future Johnny is crippled after Dark Danny injures him and is forced to stay in a wheelchair. Johnny still has his shadow and Kitty at his side, but the former's usually busy pushing his wheelchair and the latter's too elderly to fight.
In "The Fright Before Christmas," Johnny appears along with many of the ghosts that Danny had faced in previous episodes, and in light of the Christmas truce helps Danny save Christmas.
In "Girls' Night Out," Kitty has again split with him due to his womanizing attitude and love for his motorbike. She uses her banishing kiss on him to make him disappear (only to reappear later when Maddie, Sam and Jazz undo the effects of the kiss).
Johnny's final appearance (alongside Shadow and Kitty) is in the series finale, "Phantom Planet." He's first seen terrorizing Dash and Kwan in the halls of Casper High. All three then assist Danny in saving the Earth.
Powers and Abilities
Johnny has standard ghost powers (intangibility, invisibility, flight, overshadowing), but he usually prefers to cause mayhem on his bike which can fire blasts from its headlight. His main ability is to summon his shadow to stop his enemies.
Revealed in "13," Shadow is the source of Johnny's powers. It has its own will but obeys its master's every command. It has the power to spontaneously cause events of bad luck.
Johnny cannot do much without his Shadow or his motorcycle and is always distracted by other girls. Johnny's Shadow has weaknesses of its own.
- Johnny hid his ghostly glow when he first met Jazz.
- While somewhat of an enemy to Danny, he seems to not mean him any lasting harm. Their fight in "Girls' Night Out" seems to have been meant to be similar to a boxing match for him.
- Johnny 13 is tied with Vlad Plasmius and Youngblood as the character with the shortest span between two episodes as the main villain: "13" and "Lucky in Love" are only 4 episodes apart from each other.
- If all the ghosts' names were listed alphabetically, Johnny 13 and Kitty would be next to each other.
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