Mark "Conan" Stevens is an Australian actor, writer, stuntman and former professional wrestler. He is 213 cm (7’) tall.
Stevens portrayed giant green swamp monster Man-Thing in Marvel's Man-Thing film and Gregor Clegane ("The Mountain") in the first season of the HBO television series Game of Thrones. He was cast to portray Bolg, son of Azog, in Peter Jackson's Hobbit trilogy, and completed a portion of the films' photography in makeup as the character. He was subsequently replaced in the role by Lord of the Rings trilogy veteran Lawrence Makoare when Bolg was revamped into a completely CGI character. He ended up playing an unnamed Gundabad Orc, called "Keeper of the Dungeons" in The Hobbit: The Battle of the Five Armies.
Stevens co-wrote the 2009 martial arts film, Bangkok Adrenaline.