Medieval warriors appear in first 'Transformers: The Last Knight' trailer

April 12 (UPI) -- Paramount Pictures has released the official trailer for Transformers: The Last Knight.

Directed by Michael Bay, the science-fiction, action picture is to open in theaters June 23. The movie stars Mark Wahlberg, Josh Duhamel, Anthony Hopkins, Laura Haddock, Jerrod Carmichael, Isabela Moner and Santiago Cabrera.

"The Last Knight shatters the core myths of the Transformers franchise, and redefines what it means to be a hero. Humans and Transformers are at war, Optimus Prime is gone," said a synopsis accompanying Wednesday's clip on YouTube. "The key to saving our future lies buried in the secrets of the past, in the hidden history of Transformers on Earth. Saving our world falls upon the shoulders of an unlikely alliance: Cade Yeager; Bumblebee; an English lord; and an Oxford professor. There comes a moment in everyone's life when we are called upon to make a difference. In Transformers: The Last Knight, the hunted will become heroes. Heroes will become villains. Only one world will survive: theirs, or ours."