It's the fifth instalment in the heavy-metal machine series and Optimus Prime has gone AWOL. The shape-shifting robots are arriving on Earth in increasing numbers to be met with resistance from the Transformers Reaction Force. Meanwhile, inventor Cade Yeager (Mark Wahlberg) hooks up with an English lord (Anthony Hopkins) and a voluptuous Oxford don (Laura Haddock) to thwart Megatron's diabolical plan to drain Earth of all life. Fans of over-sized, antagonistic mecha-beings are well rewarded with another all-action blitz on the senses.