Chuck Season 4 Episode 6 (Chuck s04e06) with title “Chuck Versus the Aisle of Terror” aired on Monday, October 25th 2010 at 08:00 pm via NBC Network.
Here is summary for Chuck Season 4 Episode 6 :

When Chuck, Sarah, Casey, and Morgan are tasked to stop Dr. Stanley Wheelright from releasing a nightmare-inducing toxin, they’re also lead to question the allegiances of Chuck’s mom. 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.