The Secret War of Lisa Simpson

"The Secret War of Lisa Simpson" is the twenty-fifth episode of Season 8 that aired on May 18, 1997. The episode was written by Richard Appel and directed by Mike B. Anderson.

Lisa is determine to stick it out as the only girl at boot camp when she and Bart attends military school. Willem Dafoe guest stars.

Plot
Lisa confronts Principal Skinner at school, concerned that lessons spent watching videos aren't helping her realize her full potential, but is rebuffed by Skinner telling her that if he did make it harder other students would be in his office about the curriculum like she is. Meanwhile, after a destructive and noisy prank involving several megaphones shatters every piece of glass in town and renders the population temporarily deaf, Homer and Marge decide to take Chief Wiggum's advice and put him in Rommelwood Military School (luring Bart into the car with the lie that they're going to Disneyland). Bart does not want to be there from the get-go, but Lisa sees the education the cadets receive and decides to stay there with him. Marge tells Lisa that if she wants to quit and come home at any time she can, while ignoring Bart's please for just that

Both of them get a hard time from the other cadets: Bart starts to fit in after a while, the others calling him a "natural solider", while Lisa, the first female ever to join the academy, remains an outcast despite enduring the same hazing as her brother. Bart tries to keep her spirits up, while keeping the fact that he cares about her a secret from the others.

At the end of term, a final challenge awaits all the students; they must pass a physical test called "The Eliminator". In the Commandant's own words, it's a "150 foot hand-over-hand crawl across a 60 gauge Hemp-Jute line with a blister factor of 12. The rope is suspended a full 40 feet over a solid British acre of Old Growth Connecticut Valley Thorn Bushes". Bart helps Lisa to train in secret. The others cheer when she nearly falls off, and Bart starts calling out helpful thing such as, "C'mon, you can do it!" and "I believe in you Lisa!" They both pass, and Lisa receives a medal for "Satisfactory Completion of the Second Grade".

Homer and Marge agree to take them to Disneyland for real but it turns out they were tricked again by taking them to a Dentist (with Bart & Lisa sad and Homer & Marge giggling).