The fourth, and most recent "Transformers" movie, "Age of Extinction" was the most successful so far, grossing $1 billion worldwide. Four more movies are in the works. Here are some other film franchises that have enjoyed a few spins through the theater:
"Tron: Legacy" scored $400 million worldwide upon its release in 2010 -- a sequel that was 28 years in the making.
"Furious 7" is the latest in the very popular "Fast and Furious" franchise.