Owen Reece gained superhuman powers by mutation through exposure to radiation from an experimental particle generator that opened a "pinhole" into the dimension of the Beyonders, irradiating him with the energies of a Cosmic Cube. As the Molecule Man, Owen has the ability to mentally manipulate molecules, allowing for a variety of effects, e.g.: the creation of force fields, energy beams & hyperspace portals and manipulating complex pieces of technology with ease. He is able to manipulate some of the most powerful and most durable materials within the Marvel Universe including destroying and reforming Captain America's shield, Thor's enchanted hammer Mjolnir, and the Silver Surfer's surfboard.[18] As a result of the accident in which he gained his powers, Owen has a series of jagged scars radiating from the bridge of his nose in a lightning-like pattern. He can use his powers to conceal the scars at will.
Although Owen's powers came from the same power source as the Cosmic Cubes, Owen Reece generally does not use this capability to the same extent as Cosmic Cubes do, limiting himself to manipulation of matter and energy. Regardless he has been able to effortlessly recreate an entire galaxy even in his regular state,[19] and on a later occasion unleashed his 'darkest aspect', which possessed sufficient might to fight, and overpower, the Beyonder in a more than 3-dimensional battle, which in turn was claimed by Kubik to be far less than his full potential