Chuck Lorre

Worlds collide in Season 3! A love affair with Penny has opened a big, wide, wonderful world of romance for Leonard. But Sheldon likes the world just the way it was, thank you. All of which makes for a zany comic triangle with brainy, clueless Sheldon and practical, grounded Penny hilariously vying for the role of hypotenuse.

Doctors Hofstadter & Cooper remain socially challenged, but the two genius roommates and their friends always produce hilarious results. With Leonard finally engaged to girl-across-the-hall Penny after countless proposals, the possibilities for happiness seem endless while the probability for laughs is a foregone conclusion. What's unknown is how this might impact the ironclad "Roommate Agreement" he's entered into with Sheldon. Add to this, Sheldon's...

"Physicists Leonard and Sheldon understand everything from the inescapable gravitational pull of a black hole to the intricate structure of the atom. But, take those atoms and assemble them into a woman and their comprehension comes to a grinding halt. And when Penny, a woman with all those atoms in all the right places, moves in across the hall, Leonard and Sheldons universe begins to expand in ways they never could have imagined"--Container.

A smart, independent brunette named Chelsea may finally have turned party-boy Charlie into a man. Jake locks lips with the cute girl next door, the one whose football-star dad is named Mad Dog. Judith prepares for a midlife baby, who may end up looking a lot like Alan. Alan dates his receptionist, then ends up in bed with her frisky mom.

This season the Big Bang gang's romantic universe expands. On the rebound from Penny, Leonard falls into the arms of Raj's sister Priya. Sheldon gets a girlfriend, or rather a friend who is a girl: Amy, a dour neurobiologist who declares herself besties with Penny. Howard and Bernadette heat up. And so do Raj and Bernadette (at least in Raj's Bollywood daydream). All in the furtherance of award-winning genius comedy.

Three Big Bang Theory episodes for the Christmas holidays.

The Leonard and Penny went from next-door neighbors to next-door newlyweds with a nuptial excursion to Vegas. This season, they find themselves in a repeating paradigm as they re-create their wedding, this time with family including Penny's mother and brother and Leonard's parents. Meanwhile, the Relationship Agreement between Sheldon and Amy added an entirely new subsection with their annual coitus clause.

For young Sheldon Cooper, it isn't easy growing up in East Texas. Being a once-in-a-generation mind capable of advanced mathematics and science isn't always helpful in a land where church and football are king. And while the vulnerable, gifted, and somewhat naive Sheldon deals with the world, his very normal family must find a way to deal with him.

The precocious young preteen Sheldon Cooper is ready for his newest challenge -- college -- as his twin sister enters middle school.