CBS

Season 2: Episode 23 - The Monopolar Expedition

The Monopolar Expedition: 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.