Okay any die hard Back to the Future fan knows that the DeLorean needs to go to the speed of 88 miles per hour and 1.21 Jigawatts to travel through time, right? In part 1 Doc Brown uses plutonium to power the DeLorean in 1985, later on in 1955 plutonium is impossible to get so Marty and Doc harness a bolt of lightning to do the job. In part 2, Doc fuels the DeLorean with a fusion machine he got from 2015, that converts trash into energy. I dont get it, are we supposed to believe a soda can and banana peel can harnesses the same power as a bolt if lightning? I mean in the sequels, they kinda left out something that basically the whole film was based upon, the 1.21 Jigawatts.