Leonard suffers through a dreadful visit from his mother (Christine Baranski) that ends up bringing him and Penny closer. ~ Bill Ecklund, All Movie Guide

Sheldon helps Penny with a financial crisis, but his solution leads to a confrontation between Leonard and Penny's burly ex-boyfriend Kurt (Brian Patrick Wade). ~ Bill Ecklund, All... Full summary

Here's a conundrum to baffle the guys: Sheldon's intelligence, which renders him socially awkward, is also the source of his new scientific procedure for making friends ~ Bill Ecklund,... Full summary

Penny wounds Wolowitz with a comment about his love life, prompting him to abandon friends who need him for a fighting-robot contest. ~ Bill Ecklund, All Movie Guide

Christmas brings no tidings of comfort and joy to Leonard, whose colleague starts dating Penny. Meanwhile, Sheldon drives everyone crazy over his adherence to gift-giving etiquette. ~... Full summary

Leonard's relationship with Stephanie is moving too fast for him, so he runs to Penny for advice. ~ Bill Ecklund, All Movie Guide

Sheldon is ecstatic when Leonard begins dating Stephanie (Sara Rue), who meets all of Sheldon's seemingly impossible standards. ~ Bill Ecklund, All Movie Guide

A smitten Wolowitz thinks he's found his soul mate -- until the woman (Sara Rue) meets Leonard. ~ Bill Ecklund, All Movie Guide

It's an all-out war between Penny and Sheldon when he bans her from the apartment for what she thinks are petty infractions. ~ Bill Ecklund, All Movie Guide

The gang is puzzled by a young grad student's attraction to Sheldon. ~ Bill Ecklund, All Movie Guide