TV fans of "The Big Bang Theory" have a lot to look forward to this month, starting with an all-new episode this Thursday when the geeky gang face off with a cyberbully. Later on, actor and nerd idol Nathan Fillion will also make a guest appearance on the show.

In Thursday's all-new episode, which is entitled "The Troll Manifestation," Leonard and Sheldon will endure bullying from an Internet hater over an online paper. According to Carter Matt, the synopsis reads as follows:

"After Leonard and Sheldon co-publish a physics paper, they must defend themselves against criticism from an online bully. Also, girls' night finds Penny, Amy and Bernadette confronting embarrassing moments from their past."

Later in February, "Firefly" and "Castle" star Nathan Fillion will make a cameo on the show playing himself, reports Entertainment Weekly. However, during the episode, the nerds will be in utter disbelief when they meet their idol in a restaurant. Leonard and Raj will also debate amongst themselves if it is really him or not and whether or not they should ask him for a picture.

Fillion, who has also appeared on "Buffy the Vampire Slayer" and "Dr. Horrible's Sing-Along Blog," is slated to appear in the Feb. 19 episode, titled "The Comic Book Store Regeneration."

In addition, the show will pay tribute to Carol Ann Susi, the late actress who played the voice role of Howard Wolowitz's nagging mother, later this month. The 62-year-old actress died last November.

According to TVLine, in the Feb. 19 episode, Howard will struggle to cope with shocking news concerning his mother. "The (presumably) tragic turn of events coincides with the reopening of Stuart's comic book store -- a shop that, much to Howard's shock and awe, features a new seating area filled with furniture from his mom's home," reports TVLine.

Season 8, Episode 14 of "The Big Bang Theory," "The Troll Manifestation," will air on Thursday, Feb. 5 on CBS.

Watch a preview below.

Related