Batman Arkham Knight - Batgirl & Harley Quinn #1 2016

This special one-shot issue expands the Arkham-verse, presenting two untold origin stories. The first tale, "Batgirl Begins," details Barbara Gordon's initial foray into vigilantism, including her first encounters with Killer Moth and Killer Croc. The second story chronicles Dr. Harleen Quinzel's transformation into Harley Quinn, showcasing her debut and first clash with Batgirl. This issue is notable for collectors as it provides key origin moments for both characters within the popular Arkham game continuity, collecting previously digital-first stories in print.