Wrecker, formerly designated CT-9903, was a clone commando who served in the Grand Army of the Republic during the Clone Wars as part of Clone Force 99. Due to genetic mutations, Wrecker was much larger and stronger than the average clone trooper. He loved blowing things up, and served as the muscle and demolitions expert for his squad, which was nicknamed the “Bad Batch”. Wrecker lived through many dangerous missions during the Clone Wars, including the Battle of Anaxes in the last year of the war. He and his squad-mates were partaking in the Conquest of Kaller when Order 66 was initiated, and as Wrecker, Hunter, Tech, and Echo remained unaffected (Crosshair was affected but had some level of resistance to the order), they watched with much confusion as their clone brothers turned on the Jedi.

Upon returning to Kamino, the squad was apprehensive to the new Galactic Empire that was being established as well as the clones’ complete loyalty to the new regime. Although Crosshair, after having his inhibitor programming modified to give maximum loyalty to the Emprire, chose to stay and serve the Empire, Wrecker and the others, joined by the young clone Omega, decided to go on the run. Tracked by the Empire and with no other resources, the Bad Batch became mercenaries.