Guest Stars James Denton as Mr. Lyle Silas Weir Mitchell as Luke Carlo Clare Carey as Dr. Melissa Blass Lois Nettleton as Gloria Randy J. Goodwin as Dr. Alan Covney Ted W. Henning as Dr. Paul Arnett Co Starring Enrique Murciano as Tony Allen Scotti as Zookeeper Stephanie Brown as Monique Howard S. Miller as Roy Dennis Gubbins as Nick Gunther Jensen as Mr. Truly Christopher Crabb as Mike Stan Yale as Homeless Guy Wendy J. Gigler as Nancy