 Additional cast members included Daniel Roebuck and Roger Guenveur Smith as FBI agents Agent Weine and Agent Schreck ; Brendan Fehr , Christine Chatelain and Lisa Marie Caruk as students George Waggner , Blake Dreyer and Christa Marsh ; Barbara Tyson and Robert Wisden as Barbara and Ken Browning , Alex ' parents ; and Forbes Angus as teacher Larry Murnau . 
