Krypto was originally baby Kal-El's dog while they were on Krypton. Jor-El, testing prototypes for the rocket that would eventually send Kal-El to Earth, decided to use Krypto as a test subject. However, Krypto's rocket was knocked off-course; the rocket drifted through space for years until it eventually landed on Earth, where Krypto was reunited with the now-teenaged superhero, Superboy. Due to the environment of Earth's yellow sun and lower gravity), Krypto possessed the same powers and abilities as his master, although his physical abilities were proportionate to his smaller size and species, similar to an ordinary dog vs. a human. Certain sensory abilities of Krypto's (senses of smell and hearing) would be more acute than those of Superman, just as an ordinary dog's senses would be more acute than those of an ordinary human. Krypto also had super-canine intelligence (approximately human level, though with his canine traits and interests still present).
When fighting crime, Krypto usually wore a gold collar, a miniature facsimile of the famed Superman-"S" symbol for a dog tag, and a dog-sized version of Superman's cape.
When not accompanying Superboy/Superman, Krypto spent much of his time romping through space; while on Earth, however, he stayed with the Kent family, posing as their pet dog, "Skip". In that identity, his guardians applied a brown dye patch on his back for a disguise which Krypto could burn off with his heat vision when he went into costume.
- Superhuman Strength
- Superhuman Speed
- Heat Vision
- Enhanced Sight: Includes telescopic vision, microscopic vision, and X-ray vision
- Enhanced Sense of Smell
- Superhuman Durability: As long as the Krypto is charged under a yellow sun, he doesn't need to eat, breathe, or sleep. He is also impervious to extreme heat and cold. Able to survive indefinitely in a vacuum in a yellow sun system.
- Eidetic Memory
- Genius Level Intellect: Had much higher than normal intelligence for a canine, about the level intelligence of a 5 or 6 year old child.
- Vulnerability to Kryptonite
- Vulnerability to Magic
- Krypto had a canine behavior that could affect his effectiveness in heroism, before Kal-El trained him adequately.  (Formerly)
- This version of Krypto, including all history and corresponding appearances, was erased from existence following the collapse of the original Multiverse in the 1985–86 Crisis on Infinite Earths limited series. Even though versions of the character may have since appeared, this information does not apply to those versions.
- 251 Appearances of Krypto (Earth-One)
- 14 Images featuring Krypto (Earth-One)
- Quotations by or about Krypto (Earth-One)
- Character Gallery: Krypto (Earth-One)
Superman Family member