<P> After fleeing from the TRF, Barricade, and the police (causing many car accidents along the way), Cade, Viviane, Bumblebee, and Cogman follow the clues left by Viviane's father and take the museum submarine HMS Alliance (after Burton shuts down the attraction and evicts the tourists) into the sea to find the Cybertronian Knights' sunken ship while the TRF pursuit them with submarines of their own . Burton meets with the Prime Minister to engage the military at Stonehenge, which he deduces is the access point to Unicron . In the ship, Cade and Vivian discover the tomb of Merlin and the staff . Viviane activates the staff, and the ship rises to the surface . The TRF confronts the group and attempt to take the staff from them before a mind - controlled Optimus intervenes and forces them to hand over the staff . Bumblebee chases after Optimus and the two Autobots fight each other . Before Optimus can kill Bumblebee, the mute Autobot finally speaks, freeing Optimus from Quintessa's control . Megatron, revealed to be conspiring with Quintessa and unhappy with Optimus's failure, arrives to steal the staff and flees while the Knights attack Optimus for his presumed betrayal . Cade stops the Knights with the talisman, which transformed into the sword Excalibur, and the Knights yield to Cade as the last Knight, who then urges Optimus to fight for Earth once more . </P> <P> As Cybertron anchors itself to Earth, Megatron, Nitro Zeus, and Barricade deliver the staff to Quintessa, who begins draining the life force of Earth from Unicron . Burton and the British military intervene, and Megatron shoots Burton, who dies with Cogman at his side . The Autobots arrive to join the fight with the TRF, Cade, Viviane, Izabella, and Sqweeks, landing on Cybertron and battling against Megatron and Quintessa's minions, the Infernocons . Vanquishing their foes with help from the Knights as the dragon, the Autobots reach the chamber where the staff and Quintessa are . Optimus defeats Megatron by kicking him through the Ignition Chamber's wall, sending him flying through Earth, while Bumblebee kills Nitro Zeus . Together, Optimus and Bumblebee seemingly kill Quintessa . Viviane removes the staff, stopping Cybertron's destruction of Earth but leaving both worlds connected . Optimus declares that humans and Transformers must now work together to rebuild their worlds, and sends a message calling any surviving Autobots to come home . </P> <P> In a mid-credits scene, scientists inspect one of Unicron's horns in a desert . Quintessa, who has survived and is disguised as a human, arrives and offers them a way to destroy Unicron . </P> <Ul> <Li> Mark Wahlberg as Cade Yeager, a single father and inventor, who helped the Autobots during the events of Age of Extinction . </Li> <Li> Josh Duhamel as William Lennox, a former NEST commander and U.S. Army Ranger captain, who partnered with the Autobots prior to the events of Age of Extinction, and now a U.S. Army Colonel and reluctant member of the Transformer Reaction Force (TRF). </Li> <Li> Stanley Tucci as Merlin, King Arthur's wizard and Viviane's ancestor . Tucci was originally reported to be reprising his role as Joshua Joyce from Age of Extinction . </Li> <Li> Anthony Hopkins as Sir Edmund Burton, 12th Earl of Folgan, a astronomer and historian who knows about the history of the Transformers on Earth . </Li> <Li> Laura Haddock as Viviane Wembly, a Professor of English Literature at the University of Oxford and a polo player, who turns out to be a descendant of Merlin . Minti Gorne portrays a younger Viviane . </Li> <Li> Isabela Moner as Izabella, a street-wise tomboy who was orphaned with Sqweeks and Canopy, her only friends until meeting Cade . </Li> <Li> Jerrod Carmichael as Jimmy, a young man from South Dakota whom Cade hired from a want ad . </Li> <Li> Santiago Cabrera as Santos, a former Delta Force operative and commander of the TRF, who seeks to eradicate every Transformer and their human allies regardless of faction . </Li> <Li> John Turturro as Seymour Simmons, a former government agent with Sector Seven and NEST turned successful writer who hides out in Cuba, and was allied with the Autobots prior to the events of Age of Extinction . </Li> <Li> Glenn Morshower as General Morshower, the director of NEST in Revenge of the Fallen and Dark of the Moon who now supervises TRF operations . </Li> <Li> Liam Garrigan as King Arthur, the legendary knight who first fought with the Knights of Iacon . </Li> </Ul>

Who was at the end of transformers the last knight