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Following in the footsteps of the original Sonar, Bito Wladon of Modora, the new Sonar gains his powers to create an empire. Though the source of his powers remains unrevealed, he has stated it involved suffering through agonizing experiments. Sonar alludes to his father being a monarch, but the original Sonar has made no mention of fathering an heir. His name is revealed to also be Bito Wladon.
The new Sonar first appears in Keystone City to test his new powers. Sonar tears up the Keystone City Hall. His reign of destruction spurs the involvement of Keystone City's resident super-hero, Wally West, the Flash. The battle was brief, with Sonar flying from Keystone for a larger city to rule. Sonar planned to conquer a kingdom worthy of his royal stature.
Arriving in New York City, Sonar is able to use the sounds of Manhattan against Green Lantern Kyle Rayner. The battle was joined when the Flash tracked the villain to the Big Apple. Sonar is defeated when the Flash accelerates him faster then sound. Rayner takes Sonar to the Slabside Island Maximum Security Prison.
Through means unknown, Sonar escapes his cell and turns his powers upon himself. He cybernetically enhanced himself, radically altering his appearance. After taking five guards as hostages, he freed the rest of the prisoners.
Kyle Rayner learns of the uprising and returned to the Slab as Green Lantern. Sonar had gathered the prisoners as a small army in service to him. Villains such as Hellgrammite, Killrock, Dervish, Shrapnel, Houngan, the Alter, and Spellbinder listens as Sonar spoke of making New York City his empire. Though he was a force to be reckoned with, the new Sonar did not impress Sledge, yet another prisoner in the Slab.
Sledge joins with Green Lantern to take down their mutual enemy but would not reveal his plan. Sledge separated from the hero as Green Lantern went against the freed villains. His rescue came at the hands of Sledge. The nine foot tall villain pounds Sonar through the floor of the prison, opening a hole to the ocean in which the island prison was situated.
Green Lantern searched for Sonar but eventually gave up, believing his foe was dead at the hands of Sledge. Sonar's remains were not found.
Sonar did survive, and returned once more to battle Rayner in the middle of New York City. The effects of the so-called "Godwave" during the Genesis incident causes Green Lantern's power ring to temporarily lose all of its energy. Sonar is still defeated.
During the Ion saga Kyle watches as Sonar and Jade fight. The heroine continuously comments on how he wasn't a very threatening villain. The battle ends with a kick to Sonar's groin.
Sonar is later featured in JLA-80 Page Giant #1, discussing many supervillians with the Rainbow Raider.
Most recently, he has been seen among the new Injustice League, and is one of the villains featured in Salvation Run, the storyline where many villains are exiled from Earth. He is one of the villains sent to retrieve the Get Out of Hell Free card from the Secret Six.