The Best Episodes Written By Stephen Engel

Penny starts dating Leonard's handsome colleague; Leonard and his friends are tortured by Sheldon's obsession with gift-giving etiquette.

Director: Mark Cendrowski

Writer: Stephen Engel

Sheldon and the gang are confused when a young grad student is attracted to him.

Director: Mark Cendrowski

Writer: Stephen Engel

With his friends knowing how sour he acts when sick—and avoiding him as a result—Sheldon is nursed by Penny, who hasn't a clue what she's in for.

Director: Mark Cendrowski

Writer: Stephen Engel

When they're invited to present at a physics conference, Sheldon's reluctance to share the credit leads to a tiff between him and Leonard, and Penny's intervention only exacerbates the situation.

Director: Joel Murray

Writer: Stephen Engel

Raj gets an inflated ego and makes a play for Penny after being referenced in a magazine article.

Director: Mark Cendrowski

Writer: Stephen Engel

Sheldon finds himself booted from the gang's Physics Bowl team and replaced with Leslie, so he forms his own team, hoping to prove he's superior.

Director: Mark Cendrowski

Writer: Stephen Engel

Leonard, Sheldon and Wolowitz are ecstatic to learn that a famous science-fiction actress (Summer Glau) is on board the train they are taking to San Francisco.

Director: Mark Cendrowski

Writer: Stephen Engel

Sheldon is thrilled when Leonard starts dating a woman who meets Sheldon's stringent standards.

Director: Mark Cendrowski

Writer: Stephen Engel

When delivery of another collectible leads to Penny's lashing out at Leonard, he decides it's time to give up his habit, much to his friends' protestation.

Director: Mark Cendrowski

Writer: Stephen Engel

With Sheldon rattled over meeting Dennis, a 15-year-old physicist who's smarter than he, Leonard helps him look for a way to debunk Dennis's research.

Director: Mark Cendrowski

Writer: Stephen Engel