title: Transformers (film series)
context: Transformers is a series of American science fiction action films based on the franchise of the same name which began in the 1980s.[note 1] Michael Bay has directed the first five films: Transformers (2007), Revenge of the Fallen (2009), Dark of the Moon (2011), Age of Extinction (2014) and The Last Knight (2017).[1][2][3] A spin-off, Bumblebee, directed by Travis Knight and produced by Bay, was released on December 21, 2018. The series has been distributed by Paramount Pictures and DreamWorks.
question: How many Transformers films have there been?
answers: five