Watch The Big Bang Theory Season 4: Episode 17: The Toast Derivation Online

Watch The Big Bang Theory Season 4: Episode 17: The Toast Derivation Online with Leonard dating Priya and Priya staying with her brother, Raj, the gang starts hanging out at Raj's place, much to Sheldon's disbelief. Amy Farrah Fowler helps with him the startling realization that it is Leonard who is the social center of their group and not Sheldon.

Undeterred, Sheldon decides to create his own social group at his apartment and invites over Barry Kripke, Zack, Penny's ex, Stuart, the comic book store owner and Levar Burton, from TV's Reading Rainbow. Barry, Zack and Stuart all show up for various reasons of their own but Stuart and Barry soon become enamored with Zack's stories of getting girls and Sheldon quickly abandons them.

Meanwhile, the gang is hanging out a Raj's having chili con carne, laughing about what Sheldon would say if he was there. They soon discover that they actually miss his presence. Sheldon soon shows up, having left his newly formed group and says everything they all thought he would say. This time, though, rather than being annoyed, the gang encourages his criticism.

Amy and Bernadette kidnap Penny for a girls' night out to help her get over Leonard and his new relationship with Priya. Initially Penny is resistant to meeting anyone, but after Amy's incessant prodding, Penny decides that a one night stand may be just the thing for her

Watch The Big Bang Theory Season 4: Episode 16: The Cohabitation Formulation Online

Watch The Big Bang Theory Season 4: Episode 16: The Cohabitation Formulation  Online where we shall see that Wolowitz and Bernadette are in a great spot in their relationship but he never stays over because he always has to run home to help his mom out in the morning.

Bernadette wants them to move in together but Wolowitz can't see the two of them living with his mother working out so well. Finally, Bernadette has enough and gives him an ultimatum - her or his mother. Howard chooses Bernadette and shows up at her door all ready to move in.

Unfortunately, what Bernadette quickly discovers is that Howard didn't quite leave his mother behind - he just replaced her with Bernadette! He expects her to make him dinner, take him to the dentist and do everything his mother does. When she calls him on it, Howard thinks she's being ridiculous and hightails it back to his mother's.

­ Meanwhile, Priya, Raj's sister is back in town and reunites with Leonard, even though Raj forbids it. Penny meets Priya, and Amy Farrah-Fowler, as a witness to all of this, offers her shoulder for Penny to cry on as she understands how hard it must be to know Penny's been replaced by a much better and more suitable mate for Leonard.

At first, Penny feigns indifference but eventually she breaks down, much to Amy's delight as she can use Penny and continue her study of how intense crying and emotions are triggered in the brain.

Watch The Big Bang Theory Season 4: Episode 15: The Benefactor Factor Online

Watch The Big Bang Theory Season 4: Episode 15: The Benefactor Factor  Online and see how Leonard succumbs his manly body to the sexual pleasure of a very wealthy woman who intends to give a huge some of money to the university in exchange for a seductive night with Leonard.  Wow! Such a lucky geek this Leonard is.  Here's the story.


An incredibly wealthy older woman is considering making a huge donation to the school's science program.  When she takes a liking to Leonard, Sheldon attempts to pimp Leonard out in the name of science.


Jessica Walter guest stars as the older woman that wants Leonard. Josh Molina guest stars as the president of the University. Leonard swears that he will not sleep with her just for the money. But in the end he succumbs to her seduction. 

Watch The Big Bang Theory Season 4: Episode 14: The Thespian Catalyst Online

Watch The Big Bang Theory Season 4: Episode 14: The Thespian Catalyst  Online where Sheldon has agreed to take part in a short lecture series at the university. After completing his first lecture, he is shocked to find out just how much the students hate him as a teacher.

Amy tells him that teaching is a performing art and suggests to Sheldon that perhaps her best friend, Penny, could share some of her acting skills with Sheldon to make him a better teacher and learn to connect with his audience better. Sheldon goes to Penny and asks her to give him some acting lessons. Sheldon doesn't take Penny's direction well and is an awful actor yet he thinks he is a brilliant playwright and improvisationalist and decides to use his new found skills on his students.

Koothrappali is feeling down about not having a girlfriend and Bernadette reassures him that someone as great and cute as him will not stay single for long. Soon Koothrappali realizes he has a  crush on Bernadette and we see several daydreams with him and Bernadette. The final one ending in a Bollywood style musical number.Wow great! What a daydream.

Watch The Big Bang Theory Season 4: Episode 13: The Love Car Displacement Online

Watch The Big Bang Theory  Season 4: Episode 13: The Love Car Displacement  Online where the gang goes on a road trip to Big Sur where the guys, Bernadette and Amy are speaking at a symposium.

Penny tags along as Amy's plus one for the free spa weekend that's promised. When Wolowitz meets Bernadette's hulk of an ex-boyfriend, he becomes really insecure and they have a fight, throwing the hotel room arrangements into chaos.

Rick Fox guest stars in this on as Bernadette's ex boyfriend.

Watch The Big Bang Theory Season 4: Episode 12: The Bus Pants Utilization Online

Watch The Big Bang Theory Season 4: Episode 12: The Bus Pants Utilization Online where we shall watch how Sheldon would try to assert his superiority on his gang in a project that happens to be the brainchild of Leonard.  This is what happened.
 
Leonard comes up with a great idea for an phone app and the guys all pitch in to help. When Sheldon becomes too controlling, Leonard fires him. Penny finds Sheldon by himself in the hall, she invites him to work with her on an app of their own.


Quickly annoyed with him, Penny begs the guys to take Sheldon back. When they refuse, she convinces Sheldon to practice his sarcasm and apologize to Leonard so he can work with them again.

Watch The Big Bang Theory Season 4: Episode 11: The Justice League Recombination Online

Watch The Big Bang Theory  Season 4: Episode 11: The Justice League Recombination  Online where we shall see that Penny is dating Zack again and becomes upset when the guys make fun of him, making him feel stupid.


When they go over to Penny's to apologize to him, they realize he can help them out with the New Year's costume competition at the comic book store and offer to make him Superman in their Justice League. Unhappy that he's been usurped, Leonard calls dibs on being The Green Lantern which forces Koothrappali, much to his dismay, to dress up as Aquaman.


Zack signs Penny up to be Wonder Woman but she refuses to wear the dark wig. When Zack sides with the guys that she should wear it, she gets upset and tells the guys she's not going to the party at all. After failed attempts by Zack and Sheldon, Leonard goes over to Penny's to try and make amends and get her to come with them. They share a nice moment and at the party, the gang ends up winning the costume contest. ­