Leonard’s mother, Beverly, returns for another visit. Leonard is still not pleased with her coming over, while Sheldon is ecstatic. Penny, however, stresses over the fact that Leonard hasn’t told his mother that he is in a relationship with Penny, and she waits for the perfect moment to tell her, which seems to only be when Beverly becomes drunk for the first time. Meanwhile, Sheldon and Leonard are having friendship issues when it turns out Sheldon has been keeping frequent contact with Beverly while Leonard has been left out.