Superman (comic book) in the context of "Cover date"

Krypton is a fictional planet appearing in American comic books published by DC Comics, most commonly appearing or mentioned in stories starring the superhero Superman as the world from which he came. The planet was created by Jerry Siegel and Joe Shuster, and was named after the chemical element krypton. It was first mentioned in Action Comics #1 (June 1938) and made its first appearance in Superman #1 (June 1939). Krypton is destroyed immediately after Superman, as the baby Kal-El, is sent from the planet in a spacecraft by his parents, although the exact details of its destruction have varied over publication history.

The planet is portrayed as having been far more technologically advanced than Earth, and having orbited a red sun. Kryptonians were the dominant species on Krypton, and its inhabitants included Kara Zor-El, Krypto, Beppo, Kara Zor-L (in her case, an alternate-universe version designated "Krypton-Two"), and the supervillain General Zod.

The Fortress of Solitude is a fictional fortress appearing in American comic books published by DC Comics, commonly in association with Superman. It is the place where Superman first learned about his true identity, heritage, and purpose on Earth. The fortress functions as a place of solace/occasional headquarters for Superman and is typically depicted as being in frozen tundra, away from civilization. Its predecessor, Superman's "Secret Citadel", first appeared in Superman #17, where it was said to be built into a mountain on the outskirts of Metropolis. By issue #58 (May–June 1949) it is referred to as the Fortress of Solitude, seems at a glance to be a freestanding castle, and is said to be located in a "polar waste". When the Fortress reappears in 1958 and for the first time takes center stage in a story ("The Super-Key to Fort Superman", Action Comics #241), it is again an underground complex in a mountainous cliffside.

Traditionally, the Fortress of Solitude is located in the Arctic, though more recent versions have been in other locations, including the Antarctic, the Andes, and Amazon rainforest. The general public is either unaware or vaguely aware of the existence of the Fortress, and its location is kept secret from all but Superman's closest friends and allies (such as Lois Lane and Batman). A trademark of the Fortress is that it contains a memorial statue of Jor-El and Lara, Superman's Kryptonian parents, holding a large globe of Krypton. Although Superman has living quarters at the Fortress, his main residence is still Clark Kent's apartment in Metropolis. The arctic Fortress of Solitude concept was first created for pulp hero Doc Savage during the 1930s.

Dan Jurgens (/ˈdʒɜːrɡənz/; born June 27, 1959) is an American comic book writer and artist. He is known for his work on the DC comic book storyline "The Death of Superman" and for creating characters such as Doomsday, Hank Henshaw, Jon Kent, and Booster Gold. Jurgens had a lengthy run on the Superman comic books including The Adventures of Superman, Superman vol. 2 and Action Comics. At Marvel, Jurgens worked on series such as Captain America, The Sensational Spider-Man and was the writer on Thor for seven years. He also had a brief run as writer and artist on Solar for Valiant Comics in 1995.

Adventure Comics is an American comic book series published by DC Comics from 1938 to 1983 and revived from 2009 to 2011. In its first era, the series ran for 503 issues (472 of those after the title changed from New Adventure Comics), making it the fifth-longest-running DC series, behind Detective Comics, Action Comics, Superman, and Batman. The series was revived in 2009 through a new "#1" issue by artist Clayton Henry and writer Geoff Johns. It returned to its original numbering with #516 (September 2010). The series ended again with #529 (October 2011) prior to a company-wide revision of DC's superhero comic book line, known as "The New 52".