A Time Rangerers Idea

I think the Time Rangerers should travel back in time to 1985, hill Valley California to witness Marty McFly travel back into time with the DeLorean and preform first aid on Doc brown so he wont die and Marty comes back to see the puppets and runs back to his house screaming and re-thinking everything. Its probably the worst idea anyone has ever come up with, but hey. I think up bad ideas when I'm confused.