TR

Season 22, Episode 21

500 Keys

7/ 10May 15, 201123 min

After finding the keys to every door in Springfield, Lisa finds a hidden room beneath the elementary school.

Directed by
Bob Anderson
Written by
John Frink

Guest stars

All episodes — Season 22

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  1. S22 E1

    Elementary School Musical

    Sep 26, 20106.123 min

    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.

  2. S22 E2

    Loan-a-Lisa

    Oct 3, 20106.523 min

    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.

  3. S22 E3

    MoneyBART

    Oct 10, 20106.522 min

    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.

  4. S22 E4

    Treehouse of Horror XXI

    Nov 7, 20106.323 min

    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 hi

  5. S22 E5

    Lisa Simpson, This Isn't Your Life

    Nov 14, 20106.723 min

    Fearing that she will end up like Marge, Lisa pledges to focus solely on her academics and not get distracted by other things; Bart puts Nelson in his place and unintentionally earns the title of school bully.

  6. S22 E6

    The Fool Monty

    Nov 21, 20106.223 min

    Mr. Burns becomes distraught at the town's apathetic reaction to the announcement that he has only weeks to live; Bart secretly takes Burns into the family's home.