Family Grace (wife), Max (son)
Occupation Mechanic (Al's Autoshop), Kryptonian scientist
Powers and
All Kryptonian powers under a Yellow sun (Demonstrated: Longevity), powerless due to blue kryptonite bracelet
Played By Marc McClure
Status Deceased (Persona)
"It's not every day a fellow Kryptonian asks me for help." - Dax-Ur, to Clark, Persona

Dax-Ur was one of Krypton's greatest scientists and was well known for designing a layout and complexion of a machine that was later dubbed Brainiac. When he realized the danger of his design and that it had the potential to destroy entire planets once it was finished, he abandoned his work and retreated to Earth.

Another great scientist named Jor-El decided to pickup where Dax-Ur had left off, by giving it a human-like form, so that the Ruling council could use it to run Krypton. He is later confronted by his creation — Brainiac — who sucks his mind of all its information to gain certain knowledge, leaving him dead.

Early life

Dax-Ur was born on the planet Krypton and grew up to become a scientist, it seems he was acquainted with the House of El as he noted they were survivors. He eventually designed the Brain InterActive Construct, a supercomputer capable of storing vast amounts of knowledge and power from an independent energy source that would last forever. Dax-Ur realized it was too powerful and had the capability to destroy worlds so he abandoned his project, a century and a half later, another scientist named Jor-El discovered his work and built Brainiac to serve as Krypton´s supercomputer.

Dax-Ur then fled to Earth in the early 19th century, seeking redemption for his creation of Brainiac and planned to study the effects of the planet's yellow sun on Kryptonian minerals, but discovered the powers he had gained from its radiation and realized that he could save the human race. However, he willingly suppressed his powers with a bracelet that contained blue kryptonite and ended up settling down with a human wife, Grace, eventually fathering a son, Max.

Powers and Abilities

Dax-Ur has the same powers as any Kryptonian receives under a yellow sun but had chosen long ago to sacrifice his powers to grow old with his human wife. He is depowered by blue kryptonite so did not demonstrate any of his natural abilities on-screen.

  • Longevity: Due to the effects of the yellow sun, Dax-Ur could have lived forever like all Kryptonians.


Dax-Ur is vulnerable to various types of kryptonite, like any other Kryptonian. However, he had chosen to become vulnerable by wearing a blue kryptonite bracelet, which painlessly depowers a Kryptonian (unlike green kryptonite). Ultimately, he was vulnerable to Brainiac's attack, who removed all his knowledge in order to repair himself, which left Dax-Ur in an unknown state.

Season Seven


Dax-Ur holding his beacon

When Clark Kent returned from imprisonment in the Fortress of Solitude, he asked Lionel Luthor for help in finding Dax-Ur and defeating Bizarro. Lionel instructed him to use a special Kryptonian shield to locate Dax-Ur: Clark took Lionel's advice, unaware that the senior Luthor was actually Brainiac in disguise.


Clark and Dax-Ur

Clark managed to put Chloe Sullivan's prior suspicion toward Bizarro to rest and confirm that he was the real Clark. He subsequently took Dax-Ur's shield from Chloe and located Dax-Ur, inquiring why he gave up his abilities for Grace and Max. Dax-Ur answered the question and asked for Clark's name, adding that it wasn't everyday that a fellow Kryptonian asked him for help. He gave Clark a chunk of blue kryptonite, assuming Clark also wanted to give up his powers in exchange for love and family.


Brainiac downloads Dax-Ur's knowledge.

Unbeknownst to Clark, however, Brainiac had followed him and confronted Dax-Ur, informing his creator of his weakened state. Dax-Ur attempted to regain his powers by removing his bracelet, but Brainiac stopped him and forcefully drained the information he needed from Dax-Ur's mind. This in turn killed him as he was mortally wounded (due to the influence of blue kryptonite) to the brain.


Clark: I'm looking for someone.
Dax-Ur: Well... If they live all the way out here, I probably know him.
Clark: Dax-Ur?
Dax-Ur: Dexter? No... no... nobody around here on that name. (he walks the other way)
Clark: Actually he's not from around here. He is from Krypton. So am I. (he tosses the beacon to Dax-Ur) I'm Kal-El.
Dax-Ur: The House of El. You always were survivors.
Season Seven, Persona

Kryptonian Shield

Main article: Kryptonian beacon
Dax-Ur Kryptonian shield

Dax-Ur's shield.

Dax-Ur owned a Kryptonian shield what emitted a certain beacon once it is activated.



Marc McClure as Jimmy Olsen.

  • Dax-Ur was played by Marc McClure, who played Jimmy Olsen in four Superman movies as well as 1984's Supergirl.
  • The similarity of the name and character indicates that this may be a reference to Jax-Ur. The change in the name was likely because this character was not a villain like all of the incarnations of Jax-Ur. It is also possible that Dax-Ur is a relative of Jax-Ur following the Kryptonian nomenclature, just as Jor-El, Zor-El and Kal-El are related.
  • In many ways, Dax-Ur represents Clark's alternate destiny, as portrayed in the "Whatever Happened To The Man of Tomorrow" series published in 1986. Dax-Ur gave up his powers and dedicated his life to raising a family while working as a mechanic. It is unknown, however, if his son has Kryptonian powers as blue kryptonite only suppresses powers.
  • Dax-Ur stated that he could save the human race after realizing that he had gained superpowers from the yellow sun's radiation: this is Clark's destiny on Earth which Jor-El sent him to Earth for.
  • In Alan Moore's story "For A Man Who Has Everything" in 1985, there is a Kryptonian major named Dax-Ur in Superman's Black Mercy-induced dream. It wasn't revealed if he's related to Jax-Ur, who was released from the Phantom Zone and attacked Kara Zor-El.
  • It is unknown whether or not his son Max inherited Kryptonian abilities, something Conner Kent did when his Kryptonian DNA started to take over. Although Max was conceived when his father was wearing a bracelet that contained blue kryptonite, that makes all Kryptonians to lose their powers under its effect, so it seems more probable that he did not.
Kryptonians in Smallville
Main Clark KentKaraZodBrainiacDavis Bloome
House of El Jor-El (AI, clone) • Lara-ElZor-ElConner Kent
Kandorian army Kandorian army: BasqatValaFaoraAliaCoats
Houses House of El (crest) • House of Zod (crest)
Other Disciples of Zod (Nam-Ek, Aethyr) • Dax-UrRayaFaoraKrypton