HOLLYWOOD: Supergirl has been rumoured for a potential cameo in Man of Steel. A preview of the Warner Bros film's prequel comic has revealed that Superman's cousin Kara Zor-El exists in the film's continuity. The comic, which was penned by Man of Steel writer David S Goyer, will be available as a free download with pre-orders of the Man of Steel Blur-ray and DVD at Walmart.The preview shows Kara awakening from a pod on a spaceship. Veteran artist Jerry Ordway has revealed to ComicBook.com that he has worked on the prequel issue.–GN