'Back to the Future' vs. 'Harry Potter and the Deathly Hallows: Part 2': Vote for the Greatest Summer Movie Ever

Will time travel or magical powers sweep through Round 2 of the Summer Showdown?

1984 Robert Zemeckis starts production on his fantasy film "Back to the Future," starring Michael J. Fox and Christopher Lloyd.

Summertime means summer movies, and this year could be one of the biggest season's ever. But which blockbuster of the past is truly the best? We've pitted 32 of the most successful and beloved summer movies against each other. And now you get to decide which is your favorite. After four rounds of voting, only one movie will be left standing. Which title will be declared the greatest summer movie of all time?

Back to the Future

The tricked-out robots in disguise of "Transformers" couldn't outrun a time-traveling DeLorean as "Back to the Future" raced ahead of Michael Bay's 21st century live-action resurrection of the beloved '80s franchise. Now, it's Science vs. Magic as Marty McFly and Doc Brown prepare to take on the be-all, end-all adventure of the Boy Who Lived.

Harry Potter and the Deathly Hallows: Part 2

When it came to taking on the Boy Who Lived, "The Goonies" weren't good enough as "The Deathly Hallows - Part 2" proved to be the better big n' loud fantasy adventure starring a bunch of kids and the occasional adult. Now, Harry and friends will try to conjure a few spells against "Back to the Future" -- which has us imagining the bullying Biff wandering the halls of Hogwarts, calling Ron Weasley a butthead.