"Problem is we won't be able to show it to anybody."
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The Proprietary Ultrasonic Subatomic Molecular Redistributor was an invention developed by Dr. Emmett Brown, and capable of disintegrating matter.


In order to prevent damage to people in the present day, Doc, Jules and Verne took a trip back in time 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 car battery while in use. However, the battery became drained, not by the PUSMR but by Verne watching a video. Upon returning to 1991, Doc and his sons discovered they had created a new timeline, and had to return to the Cretaceous and reintegrate the meteor before they themselves were erased from existence.