The episode opens with a summer montage and the family couch gag.

The family watches a movie and Bart plays baseball.

The Simpsons visit the natural history museum.

Ned Flanders lets people cut in line at the museum.

The family watches a 3D film about nunchucks and gets mugged.

The weapons exhibit closes before the family can enter.

Ned Flanders is disturbed by the evolution exhibit at the museum.

Ned Flanders and Reverend Lovejoy plan to teach creationism in schools.

Principal Skinner allows creationism to be taught in school.

Lisa argues with the teacher about teaching creationism as science.

Lisa complains to Marge about creationism being taught in school.

Homer reconsiders evolution and attends a town meeting.

Mayor Quimby bans the teaching of evolution in schools.

Lisa organizes a secret evolution class at school.

Lisa is arrested while teaching a secret evolution class.

The trial of Lisa Simpson for teaching evolution begins.

A creationist expert witness testifies against evolution.

The trial is interrupted by a cartoon about Bambi.

Marge reads Darwin's Origin of Species to understand the debate.

Marge comes up with a plan to help Lisa at the trial.

Marge uses a twist-off bottle to prove evolution in court.

The court repeals the ban on teaching evolution.

Ned Flanders and Lisa reconcile after the trial.