In an unexpected turn of events, life in Springfield becomes chaotic when Homer Simpson, in a fit of selfishness, causes an environmental disaster by filling the local lake with pig waste. This unleashes the wrath of the government, which decides to seal the town under a massive glass dome, trapping all citizens inside. Meanwhile, the Simpson family faces their own internal conflicts; Marge feels betrayed by Homer’s irresponsible actions, and Bart struggles to find his place amid the chaos.
As the situation grows increasingly desperate, Homer realizes that his family is the only thing that truly matters. Together with Marge, Lisa, and Bart, he embarks on a mission to free Springfield from the dome and restore peace. However, this won’t be easy, as they will have to confront unimaginable obstacles, from the anger of the trapped citizens to the government's intervention, which aims to ensure that no one escapes their glass prison.
With its trademark humor and a mix of madness typical of the beloved yellow family, the story unfolds in a journey of redemption for Homer, who learns that being a good father is more important than any material possession. Amidst laughter and absurd situations, the true meaning of family and personal responsibility is put to the test. In the end, the Simpsons will show that, despite their flaws, they are always united in tough circumstances.