Adam Campbell (born Adam Jones; 19 August 1980) is an English actor. He has appeared in films, such as Date Movie (2006), Epic Movie (2007), and Wolves at the Door (2016). He played the role of Cal Vandeusen in the horror miniseries Harper's Island (2009). Campbell also appeared as Greg Walsh in the sitcom Great News (2017), and as young Donald Mallard on episodes of NCIS (2014–16, 2020).