MC Ren is not happy right now.

Straight Outta Compton is set to hit theaters Aug 14. In the most recent trailer for the film, Ren was left out completely. This led the Compton rapper to hop on Twitter and vent his frustrations, airing out Universal Pictures and threatening not to promote the film. "Man fuck these bitches at universal pictures leaving me out the movie trailers tryin to rewrite history,” says Ren. The Villain Entertainment founder may have a right to be upset. The trailer focuses on Dr. Dre and Ice Cube, with brief appearances by Eazy-E's character. Ren and DJ Yella, the remaining members of the influential rap crew, were left out. Read his series of tweets below.

Straight Outta Compton trailer below to see why MC Ren's pissed.

Check out character posters below.