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Sheldon teaches Leonard how to understand football while a kite-fighting incident threatens Howard and Raj's friendship.
While Sheldon settles a score with his nemesis, Wil Wheaton, Wolowitz begs Leonard to get Penny to set him up with one of her friends.
An argument between Leonard and Penny proves "inconvenient" to Sheldon.
Penny throws herself at Leonard after he returns from three months at the North Pole and they begin a relationship, Penny and Sheldon start a quirky friendship though she can still annoy him, Howard begins to date Bernadette Rostenkowski and Sheldon meets Amy Farrah Fowler.