Preorders for the 4K UHD Limited Edition Steelbook of James Gunn's Supergirl have begun, with the movie still awaiting an official release date. The Steelbook is priced at $39.98 and is available for reservation on Amazon. The retailer's preorder price guarantee ensures that customers will pay the lowest price offered before the release date.

The Steelbook features artwork of Supergirl, portrayed by Milly Alcock, on the front and Jason Momoa's Lobo on the back. Inside, a scene from the film is depicted. This physical edition includes two discs: a standard Blu-ray and a 4K UHD version. Additionally, it comes with a special edition of Tom King and Bilquis Evely's limited comic series, "Supergirl: Woman of Tomorrow," which heavily inspired the film. Details regarding bonus features and director's commentary are not yet available but are expected to be included.

James Gunn's Supergirl is the second project in the new DC Universe, which aims to create a cohesive narrative across films, television, and animation. The film received a mixed reception, with IGN reviewer Clint Gage awarding it a six out of ten and noting that while Alcock's portrayal of Kara Zor-El was a strong point, the story felt fragmented.

"Supergirl: Woman of Tomorrow," the comic series that inspired the film, is an eight-issue limited series written by Tom King with art by Bilquis Evely. It follows an experienced Kara Zor-El confronting her life's purpose when she encounters a child seeking revenge. The comic is described as a space-faring road trip narrative exploring themes of unlikely alliances and self-discovery, and is considered one of the definitive interpretations of the character.