McWhirter was DGA Trainee on the television comedy Love Can Be Murder (1992, with Corbin Bernsen and Cliff DeYoung), the comedy Robin Hood: Men in Tights (1993, with Patrick Stewart), the pilot episode of Lois & Clark: The New Adventures of Superman (1993, with Teri Hatcher, Tracy Scoggins, K Callan, Persis Khambatta, Kenneth Tigar, and Clyde Kusatsu), and the sport drama Blue Chips (1994, with Alfre Woodard and Jim Beaver).