NGTV Guide: Friday, December 9

Chuck – NBC 8/7c
“Chuck vs. the Hack Off” – A mission to track down a computer super virus leads Chuck (Zachary Levi) to return to his roots as a hacker — and to call on his biggest competition, Gertrude Verbanksi (guest star Carrie-Anne Moss), for help. Elsewhere, a new Buy More employee (guest star Danny Pudi) complicates Jeff (Scott Krinsky) and Lester’s (Vik Sahay) friendship.

Grimm – NBC 9/8c
“The Three Bad Wolves” – Nick (David Giuntoli) is called to a suspected arson case, which exposes a longstanding family feud that brings Monroe (Silas Weir Mitchell) face-to-face with characters from his troubled past. While Monroe wrestles with restraining his wild side, it’s up to Nick to keep everything from going up in flames.

Sanctuary – Syfy 10/9c
“Acolyte” – Kate Freelander resurfaces with a warning about a Hollow Earth plot against an above-ground target, and evidence suggests that Bigfoot may be involved in the attack.