Television:
* Game of Thrones (2011-2013): Played the role of Greatjon Umber, a prominent Northern Lord.
* The Tudors (2007-2008): Portrayed the role of Thomas Howard, 3rd Duke of Norfolk, a close advisor to King Henry VIII.
* Casualty (1986-1995): Played the iconic character of Dr. Mike Barratt for nine seasons.
* The Bill (1984-2010): Appeared in several episodes as various characters.
* Doctor Who (1996): Played the role of Captain in the episode "The Curse of Fenric."
* Midsomer Murders (1997-present): Featured in multiple episodes as different characters.
* Poirot (1989-2013): Appeared in several episodes, including "Murder in the Mews" and "The Mystery of the Blue Train."
* Prime Suspect (1991-2006): Appeared in one episode, "The Lost Child."
Film:
* The Fifth Element (1997): Played the role of General Mondshausen, a military leader.
* The Princess Bride (1987): Played the role of the Dread Pirate Roberts, a villainous pirate.
* The Last Legion (2007): Played the role of Romulus Augustus, the last Roman Emperor.
* The League of Extraordinary Gentlemen (2003): Played the role of Captain Nemo, the inventor of the Nautilus.
* A Christmas Carol (2009): Played the role of the Ghost of Christmas Present.
Other:
* Voice acting: He has also lent his voice to several projects, including the video game "The Witcher 3: Wild Hunt" and the animated film "The Prince of Egypt."
This is not an exhaustive list, but it highlights some of Clive Mantle's most memorable roles across film and television. He is a versatile actor known for his strong performances in both dramatic and comedic roles.