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Starring in "Transformers 4" is Jack Reynor in the starring role of a race car driver. The talented and beautiful Nicola Peltz has been cast in the female lead role of Reynor's girlfriend. Mark Wahlberg has signed on to play Nicola's father Flynn Vincent. Sophia Myles will play a major role as a scientist. Peter Cullen returns as the voice of Optimus Prime, and Glenn Morshower reprises his role as General Morshower. Kelsey Grammer was recently cast as the lead villain named "Harold Attinger". Directors Guild of America DGA Award winner Michael Bay will return to direct his fourth installment of the film series from a screenplay written by Ehren Kruger.