CTV COMEDY (West) Channel (CMDYW)

Sheldon and Amy try to eliminate stress from wedding planning by applying math to the process. Also, Koothrappali "breaks up" with Wolowitz after realizing his best friend is actually hurting his confidence. (Repeat).

Sheldon and Wolowitz plan birthday celebrations for Amy and Halley, respectively. Also, Leonard receives a Christmas letter from his brother that causes him to spiral out about his own lack of accomplishments. (Repeat).

Follows Will Arnett, Jason Bateman and Sean Hayes on tour for their podcast, 'SmartLess.'.

Sheldon is humiliated on National Public Radio and vows vengeance on Kripke; and Wolowitz begins a relationship with Katee Sackhoff, who appears in a cameo. Ira Flatow also makes a cameo appearance.

Sheldon tries to teach Penny physics so she'll understand Leonard's work; Wolowitz is jealous when Leonard bonds with his girlfriend.

Sheldon helps Koothrappali pick up women at a university mixer; and Leonard is shocked to learn that Penny believes in psychics. Abby: Danica McKellar.

Follows Will Arnett, Jason Bateman and Sean Hayes on tour for their podcast, 'SmartLess.'.

Robin gets therapy by order of the court when she assaults a woman out to sabotage Barney's relationship; and Ted gets overly involved in Lily's pregnancy. (Repeat).

Ted takes his class out on a field trip, but it ends badly; and Marshall thinks his boss is too weak in a settlement with a million-dollar company, and he decides to take action. (Repeat).

Sheldon and Amy try to eliminate stress from wedding planning by applying math to the process. Also, Koothrappali "breaks up" with Wolowitz after realizing his best friend is actually hurting his confidence. (Repeat).

Sheldon and Wolowitz plan birthday celebrations for Amy and Halley, respectively. Also, Leonard receives a Christmas letter from his brother that causes him to spiral out about his own lack of accomplishments. (Repeat).

Louise gets into a feud with Becky after accidentally sending a rude message in the family text thread. Meanwhile, Darlene tries to spice up her sex life with Ben. (Repeat).

Darlene figures out a new plan to afford Mark's college tuition. Meanwhile, Jackie and Louise try to help Becky meet a new guy. (Repeat).

Davis regains his sense of smell. Also: Brent realizes how little he knows about his fellow Dog Riverites; and Scrabble champ Lacey is challenged by an unlikely wordsmith. (Repeat).

Real and imagined fears are examined as Brent and Hank try to figure out what scares Wanda; Oscar tries to prove to Emma that he can cook. (Repeat).

Brent enlists Lacey's help to get out of helping Hank on the farm; Oscar is elated when he finds a pair of pants in a ditch. (Repeat).

Brent buys a big-screen TV; Lacey regrets buying handmade jewelry from Wanda; Oscar criticizes Emma for forgetting to put the lid back on the sugar bowl. (Repeat).

Lacey's new sandwich becomes too popular; the mayor wants to fund the installation of a traffic light by cracking down on jaywalkers; and Emma offers to help design Wanda's tattoo. (Repeat).

Brent installs a security camera at Corner Gas, and is surprised by what gets caught on tape. Meanwhile, Davis gets a new stun gun, and Oscar and Emma's romantic getaway doesn't go as planned. (Repeat).

Leonard and Sheldon's apartment is robbed, so they create an elaborate security system with the help of their friends.

Newton had his apple. Sheldon has cheesecake. An impasse in his work leads Sheldon to get a job working with Penny at a restaurant known for that dessert.

Leonard is only allowed to bring one guest for his trip to the CERN science complex in Switzerland, and he's forced to choose between Sheldon and Penny.

Sheldon misses an opportunity to meet comics mogul Stan Lee, who appears in a cameo, when he has to go to traffic court after getting a ticket because of Penny.

The guys go to a garage sale and find a ring from "The Lord of the Rings" film, and the rare find threatens their friendship.

The friends try to help Sheldon overcome his fear of speaking in public.

Wil Wheaton returns and once again battles with Sheldon, this time in a bowling match; and Penny and Leonard have a fight that threatens their relationship.

Sheldon tells a lie to appease Penny and Leonard, who aren't speaking to each other, but then he gets caught.

The arrival of a famous physicist (Judy Greer), has Sheldon and Leonard competing for her attention.

Leonard tells Penny the story of how he met Sheldon.

In the third-season finale, Wolowitz and Koothrappali play matchmaker for Sheldon by setting up an online-dating profile for him. Meanwhile, Penny thinks that her relationship with Leonard has affected her ability to date "normal" men.

In the fourth-season opener, Sheldon goes on a date with Amy Fowler----his first date ever---and Penny finds herself accompanying them.

Sheldon hatches a plan to extend his lifespan when he realizes he won't be around to see the technology that will be able to download his consciousness into a robot. Steve Wozniak has a cameo.

Everyone worries for Sheldon, who begins searching for non-human companionship.