Krypto, also known as Krypto the Superdog, is a superhero dog appearing in American comic books published by DC Comics, commonly in association with the character Superman. In most continuities, Krypto is Superman's pet dog, usually depicted as a white dog of a generic pedigree. Krypto has appeared in numerous television series and films, such as the animated series Krypto the Superdog; the television series Smallville, the live-action HBO Max series Titans, the animated film DC League of Super-Pets (2022) voiced by Dwayne Johnson, and the fourth season and series finale of Superman & Lois. The character made his live-action cinematic debut in the DC Universe (DCU) film Superman (2025), and returned in the DCU film Supergirl (2026).
Publication history Krypto's first appearance was in a Superboy adventure story in Adventure Comics #210 (March 1955), and was created by writer Otto Binder and artists Curt Swan & Sy Barry. Originally intended as a one-off character, the dog attracted positive attention from the audience, and returned four issues later and became a regular member of Superboy's cast.
Character biography
The original Krypto
On Krypton, parallel evolution leads to the emergence of analogous species to Earth birds, felids, canids, and simians. They are domestic companion animals as they are on Earth. As explained in his first appearance, Krypto is originally the young dog and household pet of toddler Kal-El while they are on Krypton. Jor-El, testing prototypes for the rocket that will eventually send Kal-El to Earth, decides to use Krypto as a test subject, with the dog launched in extended cryogenic sleep. However, Krypto's rocket is knocked off-course by meteors and drifts through space for approximately ten Earth years until it eventually lands on Earth, where Krypto is reunited with the by-then teenaged superhero, Superboy. Due to the environment (Earth's yellow sun and lower gravity), Krypto possesses the same powers and abilities as his master, although his physical abilities are proportionate to his smaller size and species. Certain sensory abilities of Krypto's (senses of smell and hearing) are more acute than those of Superman, just as an ordinary dog's senses are more acute than those of an ordinary human. Krypto also has human-level intelligence, with his thoughts being represented via speech balloons. Although he has normal canine instincts he is able to make decisions rationally and suppress his instincts to achieve Kal-El's objectives, such as preserving his secret identity. Upon being reunited with Kal-El, the reawakened Krypto understands due to his sense of scent that the now-teenager is in fact Krypto's own companion from Krypton now grown to adolescence. Krypto is drawn as a medium-sized, short-haired white dog of generic pedigree. The early appearances of the character in the comics feature exaggerated anthropomorphic facial expressions; these are replaced in later appearances by a more generic canine face. When fighting crime, Krypto usually wears a gold collar, a miniature facsimile of the Superman's symbol for a dog tag, and a dog-sized version of Superman's cape. Whenever he is on Earth and wants to appear as an "ordinary" dog, Krypto pulls his collar and cape off, pulling it back on when necessary. In one story, he is gifted with a collar which contains a retractable cape that can be unfurled or hidden by pressing a stud. When not accompanying Superboy/Superman, Krypto spends much of his time romping through space; while on Earth, however, he stays with the Kent family, posing as their pet dog, "Skip". In that identity, his guardians apply a brown dye patch on his back for a disguise which Krypto burns off with his heat vision when he goes into costume; later, the Kents devise a pullcord-activated dye applicator and other methods which Krypto can use to switch to "Skip" and back without assistance. Krypto is part of two organizations of super-animals: the 30th century Legion of Super-Pets, and the Space Canine Patrol Agents. After the 1971 revamp of Superman by editor Julius Schwartz, Krypto does not appear for several years. The character returns suffering from amnesia in a 1974 two-part Green Arrow backup story in Action Comics #440 and #441. His memory is restored in 1975's Superman #287. Asked in a 2006 interview why he "liberated Krypto from the limbo kennel", writer Elliot S. Maggin said, "A man needs a dog. A superman needs a superdog." Krypto had his own feature in The Superman Family #182 (March–April 1977) to #192 (November–December 1978), written by Bob Toomey. In Alan Moore's send-off to pre-Crisis Superman, Whatever Happened To The Man of Tomorrow?, Krypto saves Superman by biting the throat out of the Kryptonite Man. Krypto is irradiated in the process and dies with the villain. In Superboy #126 (Jan. 1966) "Krypto's Family Tree", Krypto's father's name is given as Zypto, his grandfather as Nypto, and his great-grandfather as Vypto.
The modern Krypto
Pocket universe Krypto Following the Crisis on Infinite Earths continuity reboot, Superman's history is extensively rewritten, initially eliminating Krypto and all other survivors of Krypton. The Time Trapper creates a pocket universe that replicates pre-Crisis continuity and has a version of Krypto. While battling three Phantom Zone criminals, Krypto sacrifices his powers by giving Superboy gold kryptonite to depower them.
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