Back to the Future - 1985
Marty McFly (Michael J. Fox) is accidentally thrown back into the '50s when his scientist friend Doc Brown (Christopher Lloyd) gets a little wacky. Due to McFly's disruption of the spacetime continuum, he must make sure that his parents meet and fall in love or else he will cease to exist.
As if that's not enough pressure, McFly is also forced to rush back to the present to save the life of Brown. This Sci-Fi/Adventure flick was the highest-grossing film of 1985 and inadvertently launched one of the most successful franchises ever. BTTF fans still head out to conventions in droves!