As Cade tries to repair Optimus Prime, he gets caught up in a world of Transformers and human conspiracies. The government, led by Agent Harold Attinger (Kelsey Grammer), is determined to eliminate all Transformers on Earth, deeming them a threat to humanity. Cade teams up with Tessa Yeager (Shane Dyson), his daughter, and Shane Dyson (Jack Reynor), her love interest, to help Optimus Prime find the Ark and stop a powerful threat to humanity.