Homer wakes up in a world where his family and everyone in Springfield are made of Legos. Can he "put together" how he got there, and figure out how to get home before he's stuck in a world of bricks forever? Find out.

Bart is plagued with guilt when he wins the annual "Race Around the School," with an assist from Nelson, who beats up frontrunner Milhouse. Meanwhile, Homer tries to bring back the annual 4th of July fireworks display after it's canceled for budget reasons. Guest voice Glenn Close returns as Mona Simpson and Olympian Edwin Moses guest-voices as himself.