Optimus' semi-truck form is also based on a real truck ... That Are Pure Nostalgia The original "Transformers" Optimus Prime ...

Optimus Prime got a new form as Powermaster Optimus Prime. The base robot mode was essentially a redux of his first body, ...

While Optimus Prime opens the film in the form of a rusted out 1973 Marmon cab-over truck, the autobot leader eventually takes the form of an awesome 2015 Western Star 5700-based semi. We'll see ...