Transformers: Age of Extinction is a 2014 American science fiction action film based on the Transformers toy line. It is the fourth installment of the live-action Transformers film series and a stand-alone sequel to 2011's Dark of the Moon, taking place five years after its events. Like its predecessors, it was directed by Michael Bay and written by Ehren Kruger, with Steven Spielberg and Bay as executive producers. It stars Mark Wahlberg, Stanley Tucci, Kelsey Grammer, Nicola Peltz, Jack Reynor, Sophia Myles, Bingbing Li, Titus Welliver, and T. J. Miller with Peter Cullen reprising as the voice of Optimus Prime. It is the first film in the series not to feature the human cast from the previous three films, but features a new cast of human characters and many new Transformers, including the Dinobots. Returning Transformers include Optimus Prime, Bumblebee, Ratchet, Brains, Leadfoot, and Megatron (now known as Galvatron). The film was released on June 27, 2014, in IMAX and 3D.