Who said "We've got to work together. That's the only way."?

This quote is attributed to Doc Brown.

We've got to work together. That's the only way. - Doc Brown

"We've got to work together. That's the only way."

Doc Brown

"This is heavy."

"There's that word again, 'heavy.' Is there something wrong with the Earth's gravitational pull in the future?"

"Great Scott!"

"If my calculations are correct, when this baby hits eighty-eight miles per hour, you're gonna see some serious shit."