S4, E6: When Chuck, Sarah, Casey and Morgan are tasked to stop Dr. Stanley Wheelright (guest star Robert Englund – A Nightmare on Elm Street, Freddy's Nightmares) from releasing a nightmare-inducing toxin, they're also led to question the allegiances of Chuck's mom (recurring guest star Linda Hamilton). Meanwhile, Jeff and Lester use their unique sensibilities to celebrate Halloween at the Buy More, and Ellie and Awesome get a visit from Dr. Honey Woodcomb (recurring guest star Morgan Fairchild – Fashion House, Friends, Falcon Crest).