PG-13 | | Action, Adventure, Sci-Fi
A deadly threat from Earth's history reappears, and a hunt for a lost artifact takes place between Autobots and Decepticons, while Optimus Prime encounters his creator in space.
Onslaught's original alternate mode in The Transformers (1984) was an anti-aircraft truck, but this was revised to a Western Star tow truck. His green color is an homage to the Autobot Tow-Line in Transformers: Robots in Disguise (2000), who was a green tow truck.
Where the hell is your so-called magician, Arthur?
Arthur: He'll be here, Lancelot!
(at around 1h 15 mins) In the flashback scene when Sir Edmund tells about Arthur and his knights working together with the Transformers, the environment where the Round Table is placed is shown as a Gothic style cathedral ruin. In reality Gothic style didn't appear until the 12th century, so cc. 700 years later. The clothing also show similar anachronisms.
SPOILER: There is a scene in the closing credits: a human team is investigating Unicron's horn in the desert, and Quintessa in human form meets them and offers her assistance.
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