The Proprietary Ultrasonic Subatomic Molecular Redistributor was an invention developed by Emmett Brown capable of disintegrating matter. In order to prevent damage to people in modern day, Doc, Jules and Verne took a trip to the Cretaceous Period. Doc activated the PUSMR towards a meteor, effectively destroying it. The PUSMR was hooked up to the DeLorean time machine's battery while in use, however it became drained, not by the PUSMR but by Verne watching a video. Upon returning to 1991, they had created a new timeline to which they returned to the Cretaceous and reintegrated the meteor before they were erased from existence.