David James (born 28 October 1972) is a South African film, theatre, and television actor known mainly for playing the villainous Koobus Venter in the 2009 Oscar-nominated science fiction film . He is also known to South African audiences for his 2004-2006 appearance as "Mad Dog" on the long-running soap opera Isidingo, for his portrayal as Joel Joffe in the large-scale and well-received 2010 and 2011 stage productions of Rivonia Trial, and for his current role as radio station manager Hermanus Meyer on the soap opera Rhythm City.