Autobots must escape sight from a bounty hunter and so Optimus Prime and his remaining gang turn to a mechanic, his daughter, and her back street racing boyfriend for help.
It barely matters whether this movie is good or bad. Bay is now the sort of filmmaker -- the only one, perhaps -- whose moviemaking goes beyond such binary banality.
On the one hand, Transformers: Age of Extinction is barely coherent, narratively disastrous, and oppressively long. On the other: Optimus Prime riding a dinosaur robot!
In the end, though, this is still a movie about giant robots fighting each other, which is to say it's nearly impossible to take seriously on a narrative level.
The elements of a Transformer movie: cool machinery, a long-legged jail-bait female of stunning visage, cornfields/sunsets; witty dialog: 'Dude, she's an evil jock-concubine.'
Since the film is a chilling two hours and 45 minutes long, that means one's mind quickly wanders, dancing across this film's many flaws, little and big.