Doc Brown

"The future is bright for those who believe in progress."

"I've learned that true friendship is timeless."

"The universe rewards those who pursue knowledge relentlessly."

"Never underestimate the importance of a good experiment."

"Marty, we've changed the timeline. There's no turning back now."

"The future is not something that happens to us; it's something we create."

"This is heavy."

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

"Great Scott!"

"One point twenty-one gigawatts!"

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

"The future is whatever you make it, so make it a good one."

"Roads? Where we're going, we don't need roads."

"This is it, this is the answer. It's what I've been waiting for all these years. This is my chance to make a difference."

"You know what? You're right. I'm in love. I'm in love with you."

"Nobody calls me chicken!"

"I'm your density. I mean, your destiny."

"Let's see what you've got."

"We have to go back in time."

"This is the key to the future. The key to controlling time itself."

"Science rules!"

"You've been struck by lightning. This is very important. You've got exactly two minutes and twenty seconds."

"I've invented a time machine!"

"When you realize you want to spend the rest of your life with somebody, you want the rest of your life to start as soon as possible."

"Tell me, future boy, who's the president of the United States in 1985?"

"I'm conducting an experiment to see if you will help me."

"Jump in, kid! We gotta go back to the future!"

"The way I see it, if you're gonna construct a time machine into a car, why not do it with some style?"

"Einstein, he's one of you dodos. You realize what you've become? A couple of versions!"

"That's what I love about these high school chicks, man. I get older, they stay the same age."