Merlin The Return - (2000)

It is a 2000 British fantasy film. It tells the story of Merlin and King Arthur in modern times. For 1,500 years, the powers of Merlin have kept the evil Mordred and his mother Morgana captive in another world. When a present-day scientist stumbles upon the gateway between this world and the one Mordred is imprisoned in, it is up to a recently re-awakened King Arthur, Merlin and Lancelot to stop Mordred from returning, but Arthur seems more interested in slaying a large truck monster. Viewer discretion is advised.