The Mr. Fusion Home Energy Reactor (also known simply as Mr. Fusion and the fusion generator) was the name of a power source used by the DeLorean time machine. The actual unit was manufactured by Fusion Industries. Mr. Fusion was first seen when Emmett Brown returned back from 2015. He rummaged through the McFly residence's trashcan to find a banana peel, a Miller beer can (pouring in the remains of the beer, and then dropping the can in as well), and some other pieces of garbage which he dropped into the unit before closing it. This suggests that the Mr. Fusion unit could run on pure trash.