The Burning Galaxy was destroyed through the machinations of Surtur and his Fire Demons. The surviving Korbinites decided to choose a champion whom they would follow to their new home. That champion, known as Beta Ray Bill, was successful and was transformed into a cybernetic being resembling a fierce creature. The Korbinites then massed their fleet, put themselves into stasis, and followed Bill's ship, Skuttlebutt. Bill fought legions of demons sent by Surtur.
The fleeing Beta Ray Bill was appoached by Thor, who was detected as a demon breed by Scuttlebutt. He ordered his ship to fire at the Thunder God. He ambushed Thor when he broke in the ship, but was soon defeated when Thor threw Mjolnir at him. However, Bill did not give up and reached for Mjolnir. Picking it up, he shocked Thor. In the midst of battling Thor a second time, the ship crashed upon on a meteorite. As he was preparing to finish Thor, Odin magically transported the holder of Mjolnir - in turn, Bill was brought to Asgard.
Bill initially mistook the Asgardians the demons who previously had attacked his ship. However, upon seeing how Odin treats his son, Thor – he quickly discovers this not to be the case. Bill told the Asgardians his story to them and expressed his desire to take revenge on Surtur for destroying his world. He asked for Thor's hammer. Thor offered it freely, but Odin denied the trade. Odin instead sent them to Eitri and convinced Eitri to make a hammer for Bill
Beta Ray Bill has powers and physical attributes similar to Thor's, which augment his already powerful cyborg body. He possesses incalculable strength, near invulnerability, immune to disease, and virtually immortal. Thanks to the Alltongue, he is also capable of speaking with any species. He was deemed to be an Alpha Plus by the Galadorian Spaceknight Ikon.
By tapping his enchanted hammer on the ground, he is transformed from his Beta Ray Thor form to his mortal form. For his Korbinite body, it is transformed into a cane. He can transform back into his Beta Ray Thor form by tapping his cane upon the ground or when he was in the body of Simon Walters, by pounding his fist on the ground.
Bill is phenomenally strong. He was capable of matching Thor pound per pound in their first encounter as foes to a certain extent. Bill has claimed to possess enough strength to crush entire moons with his fists, and to shatter entire planets with the force of his blows.
Beta Ray Bill is capable of running and moving at speeds greater than even the finest human athlete. With Stormbreaker, he can fly at speeds far faster than light. His reaction time is comparable to this, considering he needs to avoid things while moving at those incredible speeds.
Bill has superhuman stamina which can allow him to function at full capacity for many days at a time without tiring at the very least. In hot climates, his stamina is limitless. As a Korbinite his skin, muscle, and bone tissues had 3 times the density than the same tissue of a human being. This contributes to his superhuman weight. He is immune to penetration wounds, tremendous impacts, and falls from great heights.
Bill's body is far more resistant to physical injury than the body of an ordinary human. He is capable of withstanding great impact forces, temperature and pressure extremes, surviving in the heart of a Sun without even a slight discomfort, and even survive at point blank range, powerful energy blasts capable of destroying entire planets without any visible physical injury. If injured, his body can heal itself with superhuman levels of speed and efficiency. However, he cannot regenerate missing limbs or organs without the assistance of magic.