Transformers: The Last Knight

The most mythology-dense entry tied the Transformers to a secret history running through Arthurian legend and the Second World War.

A hidden order has guarded the Transformers’ presence on Earth for centuries. As Cybertron bears down on the planet, Cade and an Oxford professor race to find a talisman that could decide humanity’s fate, while Optimus Prime is turned against his own.

Developed through a franchise "writers’ room", it was the final Transformers film directed by Michael Bay.

The lowest-grossing of the live-action series to that point, its softer numbers prompted the studio to rethink the franchise’s direction.