As 'Back to the Future' celebrates its 40th anniversary, Lea Thompson says the first film in the trilogy has 'a perfect screenplay.'

It’s been 40 years since Marty McFly hopped into that juiced up DeLorean. One of the stars of “Back to the Future” remembers it fondly.

Back to the Future is officially 40 years old, a milestone that may have many fans thinking, "Great Scott!" After four decades, the franchise remains as popular as ever, and it all goes back to the immense success of the original.