As "Iron Man 3" opens in theaters take a look at other movies that had notable trilogies.
The "Back to the Future" franchise includes "Back to the Future," "Back to the Future Part II" and "Back to the Future Part III."
Chris McGrath/ Getty
Library of Congress
Jason Merritt/Getty Images
Andrew Burton/Getty Images
Chip Somodevilla/Getty Images
iStock / evgenyb
Frazer Harrison/Getty Images
Warner Bros. Pictures
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