Beside his work on Star Trek, Foster also appeared in supporting roles in episodes of 3rd Rock from the Sun (1998, with Patrick Kerr), Diagnosis Murder (1998, with Susan Gibney, Greg Grunberg, and Karen Sheperd), The District (2002, with Roger Aaron Brown, Erick Avari, and Christopher Michael), Providence (2002, with Ethan Phillips, Jeffrey Nordling, and Mary Stein), Dragnet (2003, with Warren Munson and Iris Bahr), Smith (2007, with Virginia Madsen, Barbara Tarbuck, William Lucking, Billy Mayo, and John Dixon), and House M.D. (2010, with Jennifer Morrison).