Behind the scenes. Despite Kovarro surviving the events of Season 2, Steven Cole hasn't returned for Seasons 3, 4 or 5, presumably due to Daenerys' khalasar having a mostly background role.; Image Gallery. Steven Cole (born 18 March , in Liverpool) is a British actor best known for his portrayal of Leo Johnson in the Channel 4 Soap opera Brookside from to He joined HBO's Game of Thrones during its second season to play the Dothraki Kovarro. Steven Cole plays Kovarro the Dothraki warrior in “Game of Thrones” and spends much of his screen time with the show’s leading lady, Emilia Clarke. But since his character is one that was made up for the HBO series (likely meant as a composite of some of the Dothraki in George R.R. Martin’s best-selling books), he said he doesn’t know.