Episode: 23 Air date: 2009-05-11 Videos: 0
Sheldon is approached by the Dean of the University to lead a scientific expedition to the Arctic. He invites the guys to go along with him for the summer and be his team. After much banter about how difficult it would be to spend a whole summer in such tight quarters with Sheldon, they decide it is too good of a career opportunity to pass up. When Penny hears the news, she knits a cap and scarf for Leonard. He is not sure how to take this, as he still has feelings for her and wonders if this may mean that she has unspoken feelings for him. He decides to ask her what the meaning was behind the gift, and she tells him she will miss him. He questions if that is all that she wants to say. Although she is tentative in her response, it is clear that they have a special connection. The show and season end with all of the guys, including Leonard, in a hut in the Arctic.
Episode: 22 Air date: 2009-05-04 Videos: 4
Stuart, played by Kevin Sussman, the comic book sales clerk goes to Leonard to ask his advice on dating Penny. Leonard advises him to act very shy around Penny. Leonard later finds out that Stuart's date with Penny goes all wrong because while making out, Penny calls out Leonard's name. In the mean time, Wolowitz has designed a toilet for the International Space Station, and has left out one of the most important parts. All the guys rally around to try to find a fix for the space toilet.
Episode: 20 Air date: 2009-04-13 Videos: 5
In this episode Penny is hit on by the sales clerk in a comic book store that the guys frequent. Leonard is devastated at this turn of events. He can't believe that Penny would date one of "them" if it isn't him. In the mean time, Sheldon gets in the middle of the budding romance by constantly challenging the new guy to engage in a Batman dialogue. The new guy is such a nerd, that he falls right into Sheldon's hands. Penny ends up asleep on the couch while the guys hash it out over what Robin's real name is.
Episode: 18 Air date: 2009-03-16 Videos: 2
Sheldon helps Penny start her own business making hair clips. Leonard and the rest of the guys pitch in to start a website and manufacture her goods. The website is pretty lame -- and they are tease Leonard about it. In the mean time Sheldon has his first cup of coffee and he is bouncing off the walls. The gang has to make 1000 Penny Blossoms over night for an order that ships the very next day.
Episode: 10 Air date: 2008-12-08 Videos: 1
Penny councils Leonard about his relationship with Stephanie when he realizes that the only reason he is dating her is that she likes him. He tries to break it off, but each time he tries they end up having sex. Finally he breaks up with her by text message.