Tom Hopper

''Tom Hopper (born 28 January 1985) portayed the character of Percival in the final episode of Merlin series 3. His characer arrived with Lancelot just in time to save Arthur and Merlin from defeat. His character would later be knighted by Arthur before continuing to fight along side him in the re-taking of Camelot .'''

His character has been confirmed to re-appear in Series 4.