Klaatu is a member of the extra-terrestrial race called the Herm, and as such it is immensely powerful, and has been described as
power incarnate. It can drain power off of large areas, such as New York, and add to its own power. It can disperse its atoms to feed on a larger area and then bring them back together. It is huge, about as tall as a skyscraper, and is unable to be harmed by physical force, In all their encounters, the
Hulk's mightiest blows do absolutely nothing. It is made up of energies and needs to consume them to survive.
Klaatu can draw power from any electro magnetic energy source, and can fly through space unaided. It is however, susceptible to certain technology, which can injure, and even destroy it, such as special energy harpoons wielded by Xeron the Star-Slayer, and special energy blasts from the Andromeda Starship1. It also cannot live for too long in an environment that is rich with oxygen.
Nothing is known of
Klaatu before his first appearance in the
Hulk saga. For unknown reasons, at an unrevealed time long ago in the past, Klaatu became the prey of the Andromeda Starship.
(Incredible Hulk II#137) (fb)- Long ago, a youth who was an oarsman on the Andromeda Starship faced
Klaatu alone for unknown reasons.
Klaatu destroyed the youth's craft, but the youth was rescued. However, half of the youth's body was burned badly and replaced with machinery. The youth went on to hunt Klaatu for the rest of his life, as Captain Cybor of the Andromeda Starship.
(Incredible Hulk II#136)- There was a power shortage in mid-Manhattan, strongest at the Empire State Building.
Hulk jumped to the top since he sensed something troubling there. A ship, the Andromeda Starship, with a crewman named Xeron the Star-Slayer wielding a harpoon, showed up and flew toward the Empire State Building. Then, from within the building,
Klaatu emerged. When he emerged, the power went out all over New York. As
Hulk looked on, he was very confused, but dove to attack
Klaatu anyway. Because of the
Hulk's interference, a shot of energy fired by Xeron the Star Slayer at
Klaatu missed. The
Hulk kept pounding and pounding on
Klaatu, but
Klaatu didn't even notice. Eventually
Klaatu just swatted the
Hulk away with a flick of its fingers.
Klaatu then faded away, saying that it would disperse its atoms to feed on the electricity all over the city. Xeron was angered that
Klaatu got away, and he knocked out Hulk with his energy harpoons.
(Incredible Hulk II#137)- Klaatu was found by the Andromeda Starship and its crew. The ship almost immediately engaged
Klaatu in battle. Xeron and Cybor blasted
Klaatu with their beams, but
Klaatu destroyed Cybor's ship. Klaatu was mortally wounded in the attack however, and as Cybor landed on its back,
Klaatu began to drift into the sun. Xeron tried to save the rest of the ship, while Cybor and
Klaatu plunged into the sun, apparently both dying...
(Incredible Hulk II#306) (fb)- Klaatu did not die, but the energy of our sun actually revitalized him (seeing as how he absorbs energy and all). The Andromeda Starship latched onto
Klaatu and
Klaatu pulled them to safety. On the way, the Andromeda Starship picked up Cybor as well.
(Incredible Hulk II#306)- Klaatu appeared in the Crossroads (a dimension of sorts that is a link to many worlds and that the
Hulk was imprisoned in at the time).
Hulk spotted him, and though he did not remember him, decided to attack anyway, mostly from territorial instinct.
Klaatu casually swatted the
Hulk away.
Hulk then ripped a signpost out of the ground and hurled it at
Klaatu. Though it did not hurt
Klaatu, it did reveal to
Klaatu where it was.
Klaatu then used his power to drain some energy from several worlds attacked to the Crossroads.
Klaatu then leaves right before the Andromeda Starship arrives. The starship then captured the
Hulk, and proceeded to track
Klaatu into \"Ocean World.\"