But his initial thrill of shopping with Penny devolves over time to him weaving ponchos as a shut-in, forcing Leonard to call on Sheldon's mother, Mary (LAURIE METCALF - "Roseanne").
Season 1, Episode 5 CC TV-14 HD SD After sensing that his pursuit of Penny isn't going anywhere, Leonard agrees to an unexpected sexual encounter with fellow scientist Leslie Winkle (recurring guest star SARA GILBERT).
Meanwhile, Penny worries that dating Leonard has ruined her for normal guys.
Leonard volunteers to sign for a package, hoping to make a good impression on Penny.
However, when he involves his obsessive-compulsive roommate, Leonard sees his attempt at chivalry go horribly awry.
Season 1, Episode 7 CC TV-14 HD SD When Wolowitz seduces Penny's friend and ends up sleeping with her in Penny's apartment, Penny sleeps on Leonard and Sheldon's couch.
Meanwhile, with Wolowitz occupied, the guys discover that they are without a fourth member of their group.