Issue Tagline: Newest Collection Of The Greatest SuperStories Ever Published Featuring SUPERMAN'S Most Fabulous IMAGINARY Adventures If Superman Had Turned To Crime If Superman Couldn't Save The World If The Kents Adopted Supergirl If Superman Retired
This is the only Giant that actually has the word annual on its cover. In practice, though, they were all annuals.Despite the tagline which states that the issues features "SUPERMAN'S most fabulous IMAGINARY adventures", not all the stories feature Superman, nor are they all outside of normal continuity.
Of course, if you wanted to be really pedantic, they all became entirely imaginary stories following Crisis on Infinite Earths. Then following Infinite Crisis they suddenly became in-continuity again for Earth-1, whose existence DC now re-acknowledges.
The back cover contains 4 covers to the 3rd issue of the Giant Lois Lane Annual (Co-Starring Lana Lang!)
Synopsis: An imaginary tale. Jimmy Olsen is editor of the Daily Planet and is also married to Lucy Lane and they have 2 kids. Superman is an old man wearing glasses. Luthor is reformed and is the mayor. Krypto is a stray dog who is captured by a dog catcher. And Bizarro is in jail for vagrancy after visiting Earth before becoming too old (he loses his powers). And Lois Lane is an old maid who was waiting for Superman to marry her.
Synopsis: After overhearing Superboy make some bitingly sexist remarks, Shar-La—an alien female from a matriarchal planet—turns Superboy into a female. In this form, he learns a little about what it's like to endure the indignities of being female in the male-dominated society of mid-20th century America. When he's returned to his normal self, Superboy takes with him a bit of wisdom he'll later need in his relationship with the self-assured Lois Lane.
The story was told in three subtitled "chapters": "The Super-Brat from Krypton", "The Young Super-Bully" and "Superman vs. Super-Menace", with each chapter being devoted to a different stage of the life of Kal-El and his evil twin.