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Krypton was the fourth planet in the Rao system.[1]

When Superman met fellow alien, Krim for the first time, he told him he was also from another planet: Krypton. Krim was familiar with the planet, telling him he had heard of it: "the planet that exploded."[2]

Background Information

In the parallel-universe of Earth-One, for centuries the people of the planet Krypton has been a technologically advanced culture, with a Science Council acting as the head of government. Although space travel was outlawed on Krypton due to an incident involving Jax-Ur stranding the Council in space, the people still continued to advance in science.

Impending Doom

Several weeks before Krypton’s impending doom, the planet was ravished by minor quakes. One quake was bad enough that Jor-El and the rest of the Kryptonian Science-Council were summoned together. Jor-El has the councils' support, as he warns them of the instability at the planets core and the coming doom, until he suggests to the council that they authorize the building of ‘Space-Arks’ and send them to the newly discovered Earth, he loses their confidence. This troubled the rest of the council because they know as does Jor-El that due to Kryptonian law, there is a ban on building ships for the purpose of space travel and exploration. Ka-Do also angrily reminds Jor-El about the rogue scientist who 20 years before wanted to exile the Ruling Council into space. Ka-Do then tells him to leave immediately.

Discouraged, he leaves and then together with his wife Lara, they immediately begin building a rocket-ship.[3] A few weeks into the building of the ship, Lara realizes that it will only fit two. Jor-El tells her that there isn’t time to build a larger ship.[4]

Jor-El repeatedly went before the High-Council to warn them of the danger. They would only laugh at him. And one council member told him that he was through listening to his "nonsense."[5]

A few weeks later, the Kryptonian date is '57-52.8'[6] and Jor-El is once again warning the High-Council about their impending doom. Their Sun, Rao is unstable and expanding,[7] and the council should order an immediate evacuation. They laugh him right out of the building.[8]

That same afternoon, the Science-Council, summons Jor-El to tell him of the council’s decision to disbar him. Moments later, the planet begins to quake for the last time. Jor-El rushes to his lab, where Lara and young Kal (as he called him) are waiting. They put Kal into the ship and as Jor-El tries to get Lara to go, but she refuses telling him that her place is by his side.[9] So, they send him to Earth an orphan from parents and planet.


Map of Krypton
Image from Superboy, #100 (October, 1962)





Indigenous species



Krypton was apparently geologically unstable, which is why it eventually exploded. This was in part caused by the expansion of Rao, which apparently had a major effect on Krypton's atmosphere and in turn the core below the surface of Krypton.

Krypton was much larger than Earth, which is why its' gravity was so much stronger.[10] In fact, one chunk of Krypton that made its' way to Earth, nearly colliding with it, was the size of an average planet, indicating that Krypton must have been enormous.[11]


SuperFriends TV Show (1973-85)



  1. As established in multiple episodes.
  2. As seen in the Season 1 episode: The Balloon People (November 3, 1973).
  3. Jor-El called young Kal-El’s ship a ‘rocket-ship’ in the Season 1 episode: The Planet-Splitter (December 15, 1973).
  4. Summary from Season 1 episode: The Planet-Splitter (December 15, 1973).
  5. As seen in the Season 3 episode: Secret Origins of the SuperFriends (October 28, 1978).
  6. As seen in the 1983 Shorts: The Krypton Syndrome (September 24, 1983).
  7. As Rao was going 'supernova' the cosmic radiation disrupted Krypton internally, causing it to experience core instability.
  8. As seen in the 1983 Shorts: The Krypton Syndrome (September 24, 1983).
  9. As seen in the Season 1 episode: The Planet-Splitter (December 15, 1973).
  10. As seen in the Season 1 episode: The Planet-Splitter (December 15, 1973).
  11. As seen in the Season 2 episode: Will the World Collide? (December 3, 1977).
  12. As seen in the opening theme of The New Adventures of Superman.
  13. As seen in the opening theme of Superman.
  14. As seen in the Season 1 episode: The Menace of the White Dwarf (November 24, 1973).