Elyes Gabel. Actor: World War Z. Elyes Cherif Gabel gained recognition for his portrayal of Dr Gurpreet "Guppy" Sandhu in the BBC medical drama Casualty (2004-2007), computer genius Walter O'Brien in the CBS series Scorpion (2014-2018), Dothraki Rakharo in Seasons 1 and 2 of the HBO series Game of Thrones (2011-2012), and PE teacher Rob Cleaver in the BBC One school-based drama series Waterloo Road (2009). Gabel was last seen...