Dr Xadu was not a warrior, and chose to hide his powers and masquerade as Superboy's foster father Jonathan Kent, all in a ruse to find the secret location of the Phantom Zone Projector. Caught in his own machinations; Xadu and Zeda were rocketed to Planet Exon around a distant red sun; where they were trapped by the loss their Kryptonian powers.
Ten years later, Superman encountered Dr Xadu again, this time Xadu was disguised as Clark Kent's dentist. Under Kryptonian anaesthesia, Superman was hypnotized into wanting to destroy the world; though unsuccessfully. When Superman actually seemed on the brink of world destruction, Xadu's hand was forced and he was made to reveal the Cosmic Power Grip which had transported them from Planet Exon, and doomed Superman.
With a massive static charge having separated them, Superman placed Dr Xadu and his wife Erndine in prisons in different galaxies.
- Kryptonian Physiology: Under the effects of a "yellow" sun, Dr Xadu possesses the same potential powers as an average Kryptonian. These include:
- Solar Energy Absorption: Under optimal conditions, this is the main source of Dr Xadu's super powers as they are contingent upon exposure to solar radiation from a yellow sun star system. Her biological make up includes a number of organs which lack analogues in humans and whose functions are unknown. It is believed that between one or more of these and her bio-cellular matrix, "yellow" solar energy is stored for later use. This allows for the use of these powers to fade when yellow solar radiation is not available instead of immediate failure.
- Heat Vision: Dr Xadu can, as a conscious act, fire beams of intense heat at a target by looking at it. She can vary the heat and area affected.
- Super-Hearing: Dr Xadu's hearing is sensitive enough to hear any sound at any volume or pitch. With skill and concentration, she can block out ambient sounds to focus on a specific source or frequency.
- Enhanced Vision: Dr Xadu's vision processes the entire electromagnetic spectrum as well as allowing vast control over selective perception and focus.
This umbrella ability includes the following:
- Electromagnetic Spectrum Vision: Dr Xadu can see well into most of the electromagnetic spectrum. She can see and identify radio and television signals as well as all other broadcast or transmitted frequencies. Using this ability, she can avoid detection by radar or satellite monitoring methods. This also allows her to see the aura generated by living thing.
- Telescopic Vision: This is the ability to see something at a great distance, without violating the laws of physics. Though limited, the exact extent of the ability is undetermined. In function, it is similar to the zoom lens on a camera.
- X-Ray Vision: This is the ability to see through any volume of matter except lead. Dr Xadus can see things behind a solid, opaque object as if it were not there. She can focus this ability to "peel back" layers of an object, allowing hidden image or inner workings to be observed. The exact type of energy perceived—such as x-rays, cosmic rays, or some other energy invisible to normal humans—is unclear. This ability perceives an ambient energy source though, it does not involve the eye projecting a concentrated, possibly toxic, beam to be reflected back from objects.
- Microscopic Vision: This is the ability to see extremely small objects and images down to the atomic level.
- Infrared Vision: Dr Xadu can see with better acuity in darkness, and to a degree in total darkness.
- Flight: Dr Xadu is able to manipulate graviton particles to defy the forces of gravity and achieve flight. This ranges from hovering to moving in any posture, in any direction.
- Invulnerability: Due to the interaction of her dense molecular structure and supercharged bio-electric aura, Dr Xadu is nigh-invulnerable to extreme energy forces. In addition, her extends this protection against toxins and diseases.
- Superhuman Stamina: Dr Xadu is able to maintain continuous strenuous physical action for an indefinite period of time. This based on her body converting yellow solar radiation directly to energy, but is limited by physiological and psychological needs to eat, drink, and sleep.
- Superhuman Strength: Dr Xadu's strength is augmented by yellow solar radiation interacting with the greater than human density, resilience and biological efficiency of her musculature. Her strength is more an act of conscious will on energy fields than actual physical strength. It is this act of conscious will that enables her to perform physical feats that are beyond the mere application force, such as moving a mountain top without said rock crumbling under its own mass.
- Superhuman Speed: Dr Xadu is able to move at incredible speed by sheer force of will. This extends to her perceptions and allows for feats such as catching bullets in mid flight as well as covering vast distances in little or no time.
This also confers:
- Super-Breath: Dr Xadu is able to create hurricane force winds by exhaling air from her lungs. She can chill the air as it leaves her lungs to freeze targets. She can also reverse the process to pull large volumes of air or vapor into her lungs.
- Longevity: Dr Xadu can live longer than regular humans, remaining at her prime as long as she was under the exposure of the "yellow" sun.
- Cosmic Power Grip (When in contact with Erndine Zeda)
- Kryptonian Physiology: Under the effects of a "yellow" sun, Dr Xadu possesses the same potential weaknesses as an average Kryptonian. These include:
- Planet Transporter
- Energy Implant
- This version of Doctor Xadu, 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.
- Action Comics #279 states that Xadu's original crime, suspended animation research, was later legalized, if not on Krypton at large, then at least on Kandor after it was shrunken and bottled.
- 13 Appearances of Xadu (Earth-One)
- 4 Images featuring Xadu (Earth-One)
- 1 Quotations by or about Xadu (Earth-One)
- Character Gallery: Xadu (Earth-One)
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