Lucas Carr was nicknamed "Snapper" for his habit of snapping his fingers when happy. A student at Happy Harbour High, Snapper had just finished spreading lime on the family lawn when all the inhabitants of the town came under the mental control of one of Starro the Conqueror's deputies - except Snapper.

The Flash (Barry Allen) arrived and defeated the Starro deputy and discovered Snapper's immunity to its powers. Barry took Snapper with him to meet the rest of the Justice League, where Hal (Green Lantern) Jordan used his power ring to discover that the teenager's hands were coverd in lime. Aquaman pointed out that oystermen use lime to kill starfish which prey on oysters. Green Lantern then used lime to coat Starro and destroy him. Snapper was made an honorary JLA member for his help in defeating Starro.

For the next few years, Snapper became known as the JLA's mascot. He often sat out the JLA's adventures, recording them in a book at a later time. He occasionally did help the League during their cases, once he became the "Joker" to help the team overcome the Royal Flush Gang. How Ironic then, that the real Joker would be the man who would get Snapper to betray the JLA's secret headquarters.

Posing as John Dough, the world's most average man, the Joker preached that those who were different (such as super heroes) were dangerous. Deluded by this, Snapper disclosed the whereabouts of the JLA's headquarters to The Joker, and that ended Snapper's membership of the League.

Some time later, a villain called Anakronus invaded the Carr home and threatened to kill them unless the JLA gave him the money they were raising on a charity telethon. Snapper talked to Green Lantern by phone and got the League to stop the lunatic. Although he still had his JLA signal device, Snapper hadn't used it and didn't feel he still had the right to do so.

Snapper left Happy HArbour for graduate school, but everywhere he went, he was dogged with the "mascot" tag he had earned with the JLA. Eventually wandering the streets, Snapper encountered the Key who had once used mind control on him. Desperate, Snapper went along with the Key's proposition that they team as the villainous Star Tsar. The JLA defeated them and proved that they had both been used as pawns by the real Star Tsar, who was actually a supposed hero named the Privateer.

The JLA then helped Snapper to get a job with STAR labs and he dropped the nickname, becomeing known thereafter as Lucas or Luke.