When Maggie is revealed to have an IQ of 167, Lisa is no longer the genius of the family, causing a rivalry between the sisters.
Episode rating
Cast of episode
90
5
4
- Lisa Simpson
- Homer Simpson
- Bart Simpson
- Moe Szyslak
- Marge Simpson
- Ned Flanders
- Henry
- Milhouse Van Houten
- Agnes Skinner
- Additional Voices