Sheldon get upset about his career, the destruction of the comic book store and Leonard and Penny’s future living arrangements. Howard and Bernadette can’t keep hold of a caretaker for…

Leonard and Penny are drawn together after a disastrous visit from Leonard’s mother.

Chaos ensues when Leonard’s recently divorced parents, Alfred and Beverly, and Sheldon’s devoutly religious mother, Mary, come to town. Also, Wolowitz and Koothrappali think the government is out to get…

Personalities collide when Sheldon and Leonard’s mothers finally meet. Meanwhile, Howard finally decides to “man up” and do his fair share of the housework – but not without a little…

Sheldon hires Stuart to spend the day with Amy when he’d rather go to a movie screening. Also, Leonard’s mother, Beverly, comes to town and Penny struggles to make a…

A Christmas visit from his mother has Leonard discovering she’s kept a lot of news from him that she shares with Sheldon and worrying if she’ll approve of his romance…

After more than nine years together, the gang finally celebrates Sheldon’s birthday, surprising him with a special guest.

When Raj moves out of his apartment, Leonard and Penny offer him Sheldon’s old room.

Leonard’s book raises questions, and Amy guest stars on the new Professor Proton show.

Sheldon gets mad at Amy for ruining one of his favorite movies, Raj and Stuart try to make their online dating profiles more appealing, and Leonard tries to play the…

Penny is worried with how damaged her friendship with the guys will be in the aftermath of her sleeping with Raj while Sheldon becomes the leader of the paintball team.

Leonard is pleasantly surprised when Beverly comes to visit and she’s genuinely kind to him, until he finds out the real reason she’s there. Also, Denise and Stuart overstay their…

As Howard worries about fatherhood, he and Sheldon bond when they jointly assemble a model rocket. Meanwhile, Penny bonds with Leonard’s mother, Beverly, much to his concern.

When Penny and Bernadette go to San Diego for a pharmaceutical sales convention, Wolowitz is in charge of the kids. Also, Sheldon finds a book on experimenting on kids, and…

After Sheldon’s mother and Leonard’s father share an evening together, everyone deals with an awkward morning the next day. Also, Penny’s family arrives for the wedding ceremony, including her anxiety-ridden…

Sheldon and Amy are still down about their theory being disproven, but a VHS tape from Sheldon’s past inspires him not to give up. Bernadette turns into a pageant mom…

Smithers finds true love with a famous fashion designer, but will his new relationship destroy Springfield?

Stewie and Brian compete for the inheritance of a wealthy, older heiress. Meanwhile, Peter and Chris battle for Mr. Herbert’s affection.

When the Griffins find themselves in a financial bind, Lois is forced to find a job of her own. She gets discovered by a “voiceover” talent agent named Randy, who…