Transformers: Age of Extinction movie explained

The Autobots have gone into hiding after thwarting Sentinel Prime and Megatron's army in Chicago. This is because the government has classified all transformers as threats and has started to hunt them all down. As a result, the government has created its own transformers using the technology of the destroyed transformers to replace the Autobots. As Lockdown, a mysterious new foe, sets his sights on Earth, a mechanic, his daughter, and his daughter's boyfriend are drawn into the conflict after discovering Optimus Prime in their possession. _________. The Transformers have been outlawed for three years following the Battle of Chicago. A massive operation has been launched to find and eliminate any remaining Autobots or Decepticons at the command of CIA agent Harold Attinger (Kelsey Grammer). Unbeknownst to a number of parties, Attinger is also collaborating with Lockdown (Mark Ryan), an extraterrestrial bounty hunter. The group discovers the Autobot Ratchet hiding in Mexico...