Description:
The lightning needs to strike the clocktower, and the Delorean needs to hook onto the cable at 88mph to get the 1.21 gigawatts needed to send it back to the future. I love this movie. Also, 1.21 gigawatts is equal to 10 millon lightbulbs.
Tags:
delorean time machine, 121 gigawatts, back to the future, clocktower, biff