<Table> <Tr> <Td> </Td> <Td> The topic of this article may not meet Wikipedia's general notability guideline . Please help to establish notability by citing reliable secondary sources that are independent of the topic and provide significant coverage of it beyond its mere trivial mention . If notability cannot be established, the article is likely to be merged, redirected, or deleted . Find sources: "Gregor Clegane"--news newspapers books scholar JSTOR (June 2017) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> The topic of this article may not meet Wikipedia's general notability guideline . Please help to establish notability by citing reliable secondary sources that are independent of the topic and provide significant coverage of it beyond its mere trivial mention . If notability cannot be established, the article is likely to be merged, redirected, or deleted . Find sources: "Gregor Clegane"--news newspapers books scholar JSTOR (June 2017) (Learn how and when to remove this template message) </Td> </Tr> <Table> <Tr> <Th_colspan="2"> Gregor Clegane </Th> </Tr> <Tr> <Td_colspan="2"> A Song of Ice and Fire character Game of Thrones character </Td> </Tr> <Tr> <Td_colspan="2"> Hafþór Júlíus Björnsson as Gregor Clegane in the promotional image for the fourth season of Game of Thrones </Td> </Tr> <Tr> <Th> First appearance </Th> <Td> <Ul> <Li> Novel: </Li> <Li> A Game of Thrones (1996) </Li> <Li> Television: </Li> <Li> "Cripples, Bastards, and Broken Things" (2011) </Li> </Ul> </Td> </Tr> <Tr> <Th> Created by </Th> <Td> George R.R. Martin </Td> </Tr> <Tr> <Th> Portrayed by </Th> <Td> <Ul> <Li> Hafþór Júlíus Björnsson (season 4--present) </Li> <Li> Ian Whyte (season 2) </Li> <Li> Conan Stevens (season 1) (Game of Thrones) </Li> </Ul> </Td> </Tr> <Tr> <Th_colspan="2"> Information </Th> </Tr> <Tr> <Th> Aliases </Th> <Td> <Ul> <Li> The Mountain That Rides </Li> <Li> The Mountain </Li> <Li> Tywin Lannister's Mad Dog </Li> <Li> The Great Dog </Li> <Li> The Enormity That Rides </Li> <Li> Robert Strong </Li> </Ul> </Td> </Tr> <Tr> <Th> Gender </Th> <Td> Male </Td> </Tr> <Tr> <Th> Title </Th> <Td> <Ul> <Li> Ser </Li> <Li> Knight of Clegane's Keep </Li> </Ul> </Td> </Tr> <Tr> <Th> Family </Th> <Td> House Clegane </Td> </Tr> <Tr> <Th> Relatives </Th> <Td> Sandor Clegane (brother) </Td> </Tr> <Tr> <Th> Kingdom </Th> <Td> The Westerlands </Td> </Tr> </Table> <Tr> <Th_colspan="2"> Gregor Clegane </Th> </Tr>

Who plays sir gregor in the game of thrones