Katherine "Kat Dennings" Litwack is an American actress who portrays Leah Birch in Big Mouth before she quit voice acting in Season 4 because she was busy with other projects and Chloe Fineman took over as the new voice actress for Leah in Season 5.
Credits[]
| Character | Episode | Season | Episode No. |
|---|---|---|---|
| Leah Birch | Am I Gay? | 1 | 3 |
| Leah Birch | Girls Are Horny Too | 1 | 5 |
| Leah Birch | The Head Push | 1 | 8 |
| Leah Birch | I Survived Jessi's Bat Mitzvah | 1 | 9 |