Special Guest Stars Linda Hamilton as General McCallister Guest Stars Meredith Garretson as Kate Hawthorne Elizabeth Bowen as Deputy Liv Baker Diana Bang as Nurse Ellen Jenna Lamia as Judy Cooper Alex Barima as David Logan Mandell Maughan as Lisa Casper Ben Cotton as Jimmy Michael Cassidy as Dr. Ethan Stone Elvy Yost as Isabelle Vanderspiegel Co Starring Keith Arbuthnot as Alien Harry Rocky Anderson as Sniper Jennifer Rose Garcia as Waitress Uncredited Nathan Fillion voices Octopus / No. 42