David Bradley — Current Role: Walder Frey, the elderly head of the House of Frey. // Prior Geek Roles: While Bradley doesn't have a long screen resume, his appearance in seven of the
eight "Harry Potter" films — playing head groundskeeper Argus Filch — earns him a spot on this list. Source: TWoP
'Game of Thrones': The Cast's Geekiest Roles
See where you may have geeked out over the "Game of Thrones" cast before.