A Christmas visit from his mother has Leonard discovering she’s kept a lot of news from him that she shares with Sheldon and worrying if she’ll approve of his romance…

After overhearing that Wil Wheaton is entering a trading-card competition, Sheldon decides to enter it himself. Meanwhile, Penny sets up one of her friends on a date with Wolowitz.

A squabble between Leonard and Penny sees Sheldon playing mediator, though out of his own incovenience from the sitiation rather than altruism.

Sheldon becomes Leonard’s teacher in order to understand football, while an incident with flying a kite threatens Howard and Raj’s friendship.

Howard and Raj visit a Goth nightclub to pick up women while Sheldon attempts to build a better Penny using chocolate-based behavior modification.

Leonard and Penny struggle to recover from an awkward first hookup while Sheldon and Howard stake their best comic books on a bet to determine the species of a cricket.

Raj must find a new job or be sent back to India, but Sheldon has a solution, which leaves Leonard and Penny dealing with Howard as a third wheel.

When Sheldon learns the guys tampered with his expedition data he got from the arctic, he leaves to Texas in disgrace. This results in the guys following him, which threatens…

Walt and Hank get into a heated argument at a party. Skyler opens up to her boss. Jane hides her relationship with Jesse from her father.

Walt and his family wait for news after he undergoes a PET-CT scan. Walt follows Saul’s advice; Jesse’s relationship with Jane is put on hold when he and Walt head…

Walt and Jesse seek advice from a shady attorney when Badger gets in trouble with the law; the DEA believes they have caught up with “Heisenberg” ; Hank returns.

Skylar confronts Walt about his secrecy; Jesse falls apart; and Jane’s grief-stricken father takes action that results in further tragedy.

When unforeseen circumstances cause Walt and Jesse to lose some dealers, Saul suggests they add a new business partner. At work, Skylar confronts Ted about the unnerving information she had…

As Walt explores money laundering options, he and Jesse spar over the profits from their latest deal. Jesse and Jane clash with her father. Walt makes a fatal decision.

Walt’s secret is in jeopardy when Skyler thanks Gretchen for paying for his treatment.

Walt attempts to reconnect with his family, while Jesse struggles to rebuild his life.

Walt and Jesse become short on cash when they try to cover their tracks. Meanwhile, the DEA has a lead that could them straight to Walt and Jesse.

Hank suffers from the aftermath of his encounter with Tuco. Meanwhile, Jesse hires a crew to get their product out on the streets.

Walt and Jesse are vividly reminded of Tuco’s volatile nature, and try to figure a way out of their business partnership. Hank attempts to mend fences between the estranged Marie…

Walt and Jesse find themselves in close quarters with an unhinged Tuco. Marie and Hank comfort Skyler, who is distraught over Walt’s disappearance. Hank pays a visit to Mrs. Pinkman…

Jesse and Walt discuss expanding into new territories; Hank struggles to fit in; Skyler pursues a new job opportunity; Jesse gets to know his landlord.