Jack Ryder was co-anchor of Summer Gleeson's "Gotham Insider". When Jack did an exposé on the Joker, the Clown Prince of Crime showed up and dosed Ryder and the crew with laughing gas. He then threw Ryder into the same vat of chemicals that transformed him.
The chemicals, mixed with the Joker's toxin, triggered a mutation in Ryder. As a result, Ryder's body became bright yellow with green hair with dramatically enhanced strength and agility. Furthermore, he develops an energetically maniac personality that still is conscientious to a degree; for instance, he wildly causes a disturbance in a used clothing store looking for a costume, but also properly paid for his goods. While interrogating the Joker's henchmen, one of the goons spoke out against him, and called him a "creep" which inspired him to call himself "the Creeper". While Ryder was still honest enough to pay for his new costume, his use of his credit card alerted Batman to the wildman's real identity. Seeking revenge against the Joker and suddenly smitten with Harley Quinn, he pursued them relentlessly with terrifyingly wild enthusiasm. While the Creeper did not kill the criminals, his methods were so frenetically deranged that the Joker eventually begged to be arrested.
After an exhausting chase, Batman arrested the criminals and injected Creeper with an antidote to the Joker venom. While it successfully repressed the Creeper persona and physically changed him back into Jack Ryder, the cure was not permanent. However, Batman was able to create antidote skin patches to keep the Creeper subdued. Ryder, who actually finds the Creeper form to his liking on some level, can simply remove the patch and transform into the Creeper again.
Although crazy and created by the same chemicals as the Joker, the Creeper was essentially moral and heroic at heart, and later joined the extended Justice League to protect the world from evil.
Powers and abilities
The Creeper had enhanced strength, agility, senses and healing. He could take down Joker's thugs easily. His senses were increased as well. He could sense Joker's thugs coming at him and could even uppercut Batman from behind without turning around. He was also very durable, as seen when Harley dropped a statue on him and the Joker later tried to exterminate him with a dose of nitroglycerin, causing little to no effect.
|Members of the Justice League|
|Batman • The Flash • The Green Lantern • Hawkgirl • J'onn J'onzz • Superman • Wonder Woman|
|Aquaman • The Atom • Atom-Smasher • Aztek • B'wana Beast • Black Canary • Blue Devil • Booster Gold • Captain Atom • Captain Marvel • Commander Steel • The Creeper • The Crimson Avenger • Crimson Fox • Dove • Dr. Fate • Dr. Light • Dr. Mid-Nite • Elongated Man • Etrigan • Fire • Green Arrow • Gypsy • Hawk • Hourman • Huntress • Ice • Long Shadow • Metamorpho • Mr. Terrific • Nemesis • Obsidian • Orion • Plastic Man • Question • The Ray • Red Tornado • Rocket Red • Sand • Shining Knight • Speedy • Stargirl • Starman • Steel • S.T.R.I.P.E. • Supergirl • Johnny Thunder • Thunderbolt • Vibe • Vigilante • Vixen • Waverider • Wildcat • Zatanna|