The Scorpion's Tale
During a field trip, Lisa discovers desert water that makes usually combative creatures get along; after getting kicked out of the retirement home, Grampa comes to live with the family.
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More from this season
S22 E1
Elementary School Musical
Marge sends Lisa to a performing arts camp, where counselors and fellow campers inspire her to embrace her creative side; upon returning to Springfield, Lisa grows restless with her boring suburban lifestyle.
S22 E2
Loan-a-Lisa
Grampa gives each family member a portion of his savings; Lisa worries that Nelson's instant success with a new business venture might lure him away from continuing his education.
S22 E3
MoneyBART
Lisa starts coaching Bart's Little League team; Marge and Bart spend the day at an amusement park, where former MLB manager Mike Scioscia gives Bart advice.
S22 E4
Treehouse of Horror XXI
Worried about the effects of violent video games, Marge encourages Bart and Milhouse to play board games; Lisa becomes smitten with a new student, a vampire; while on a second honeymoon, Homer and Marge rescue a castaway who escaped from his ship.