- Previous episode S03E10 - The Gorilla Experiment
- Number S03E11
- Director Mark Cendrowski
- Writers Lee Aronsohn, Maria Ferrari, Richard Rosenstock, Steven Molaro
The Maternal Congruence
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 with Penny.