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15. Transformers

Total worldwide gross: $1.55 billion
Number of films: 2
Highest grossing film: Revenge of the Fallen ($836 million)

Despite the fact that there are only two movies in the franchise so far, the Transformers series has been successful enough to make its way onto the list. Both movies have been critically savaged, with Roger Ebert calling 2009’s Transformers: Revenge of the Fallen “a horrible experience of unbearable length." However, the filmmakers cried all the way to the bank, and a third installment in the series is scheduled for 2011.

Photo: IMDB.com