In the Back to the Future trilogy, the DeLorean time machine was the fictional time travelling vehicle use by "Doc" Emmett Brown (Christopher Lloyd) and Marty McFly (Michael J. Fox) to travel through the history of their hometown of Hill Valley, a fictional city located in Northern California. In the trilogy, the time machine was built by Doc from a regular DeLorean DMC-12 automobile which used various sources including plutonium and biofuels to generate the needed 1.21 gigawatts to power the critical component, the flux capacitor.