Guest Stars Jamie Lee Curtis as Jen Burton Bert Rosario as Sergio Sanwiler Michael Delano as Malary Pantera Tara Buckman as Majel Co Starring Mel Blanc voices Twiki the Robot Felix Silla as Twiki the Robot Charles Walker as Lt. Zimmerman Robert Cornthwaite as Warwick Jim B. Smith as Shuttle Captain Walter Hunter as Hugo Danny Ades as Gymon Uncredited Eric Server voices Dr. Theopolis