"I am from beyond. I come from beyond to your small planet to comprehend your species' strange needs and desires."
- See: Secret Wars
In order to satisfy his feeling, Beyonder began a experiment where he would take many heroes and villains of Earth and put them to a test to better understand the concept of good, evil and desire.He took many heroes, including Hulk, Spider-Man, the entire Fantastic Four, a few members of the X-Men, Avengers, She-Hulk and others. He also took many villains including Absorbing Man, Doctor Doom, Doctor Octopus, the Enchantress, Kang, the Lizard, the Molecule Man, Ultron, the Wrecker and the Wrecking Crew. They all found themselves within the same location of space time. All the heroes and villains watch as a galaxy was destroyed right before their eyes, except for one star. And in a mere seconds, a new planet was formed from those destroyed planets called, Battleworld.
In a light, the Beyonder appeared before them and said, "I am from beyond! Stay your enemies and all you desire shall be yours! Nothing you dream of is impossible for me to accomplish!" and put them on Battleworld in a fight of good versus evil.
In the mist of the Secret War, Doctor Doom had the technology to steal the Beyonder's powers, and was successful. Too weak to fight Doom, he brought back to life Klaw, who was previously destroyed by Dazzler. He then took control of Klaw and motivated him to encourage Doom's fears of his superhuman hero opponents as well as playing upon Doom's own doubts over his ability to control his new god-like powers. The Beyonder also had Klaw persuade Doom to grant him part of his power. Then, when Doom was struggling to control it during a battle with Captain America, and the Beyonder left Klaw's body and regained his full power. The Beyonder then vanished, and all in the "secret wars" returned to the places from which they had been transported from, with the Thing staying, She-Hulk being his replacement in the Fantastic Four and Spider-Man gaining a new costume.
Pre-Retcon: Powers and Abilities
The Beyonder possessed Omnipotence,Omniscience, and Omnipresence and had the power to surpass The Living Tribunal and to equal One-Above-All as he killed the concept of death itself and revive it a feat not even the powers of the cosmic beings of the omniverse can do such a impossible thing let alone reverse it he was shown to self-limit himself keeping his self on a human level so the cosmic beings wouldn't beg him.
Post-Retcon: Powers and Abilities
The Beyonder was no longer Omnipotent instead he was a Child Cosmic Cube with high reality warping powers with this he gained Nigh-Omnipotent,Nigh-Omniscient, and Nigh-Omnipresent powers that are nearly dwarfed by Eternity and surpassed by The Living Tribunal able to alter an entire universe into a toy and effect the very fabric of reality with his presence he possessed a number of different powers like teleportation,mind reading,healing,disease immunity,size manipulation, and many others.