From Wikipedia, the free encyclopedia. Mark Kinsey Stephenson is an American-born actor most famous for his role as Randolph Carter in the H.P. Lovecraft film adaptation named The Unnamable and its sequel The Unnamable II: The Statement of Randolph Carter; the latter covered the whole of Lovecraft's story, The Statement of Randolph Carter, in about ten minutes. Description above from the Wikipedia article Mark Kinsey Stephenson, licensed under CC-BY-SA, full list of contributors on Wikipedia.