Transformers is a series of American science fiction action films based on the Transformers franchise which began in the 1980s. 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). A spin-off film, 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 Pictures. The Transformers series has received negative to mixed reception, except for Bumblebee, which received positive reviews. It is the 13th-highest-grossing film series, with a total of $4.8 billion; two films in the series have grossed over $1 billion each.