DC Comics has unveiled its Summer of Supergirl campaign, as the Girl of Steel takes center stage on Superman Day with retailer celebrations, fan surprises, and a dynamic lineup of comics and graphic novels for readers of all ages. April 18 marks the historic debut of Superman in Action Comics #1 , while Supergirl first appeared more than two decades later in Action Comics #252 , quickly emerging as a global symbol of hope and empowerment. This year, Superman Day carries added excitement as anticipation builds for June’s theatrical release of Supergirl, with DC encouraging retailers and fans to join themed in-store and digital events, including talent signings, limited promotions, curated collections, and community activations nationwide. Readers can revisit Supergirl’s origins with a facsimile edition of Action Comics #252 and explore standout stories such as Supergirl: Being Super by Mariko Tamaki and Joëlle Jones , alongside a deluxe hardcover of Supergirl: Woman of Tomorr...