LOS ANGELES — Optimus Prime has transformed and is rolling ... Age of Extinction (due out June 27), Optimus is a larger, Western Star truck with a flashy aerodynamic design.

The new film, slated to open June 27, 2014, features an upgraded, custom-built Western Star truck as Optimus' vehicle form. Prime was a Peterbilt Model-379 for the last film, 2011's Transformers ...

Over the course of the franchise's 30-year tenure, one of the most iconic characters is, of course, the leader of the Autobots in their war against the Decepticons, Optimus Prime (also known in ...