Lisa is failing gym. So that she won't fail and lose the Springfield Elementary the only accreditation they have, Principal Skinner gets Lisa a private coach. After seeing a vision of President Kennedy, Lisa is inspired to give gymnastics her best shot. While Bart is spending time with Grandpa he gets bitten by a Chinese mosquito. Lisa finds out that her fellow gymnastics students are actually college age, and rather than be embarrassed by her real age, she lets them think she is college age as well. Bart is diagnosed with "Panda virus" which makes him contagious, so Dr. Hibbert puts him in a plastic bubble for a week. Meanwhile Lisa has started hanging out with college age students at a coffee house listening to Robert Pinsky read his poetry. Bart starts using his plastic bubble to rescue nerds from the bullies. Some of those nerds follow Lisa when they think she is up to something. They find her at college analyzing "Itchy and Scratchy" cartoons and Milhouse exposes her. Embarrassed she leaves and back at home, she gets in trouble for going to college (16 credit hours worth) and her fellow grade school students won't relate with her anymore. She gets advice from Bart on how to win them back, which she does by making a splash on the cake created for Seymour Skinner Day.

The Hills head to Japan because Cotton wants to apologize for his actions in WWII. The grizzled vet says he plans to address the widow of a soldier he killed. Peggy arranges to cover the visit for the local paper, but the family arrives to find it has become an overblown media event. Cotton admits to Hank that the "widow" was never married, and the "action" did not occur in battle. Meanwhile, back home, Dale and Bill prove themselves dedicated house sitters by dressing up as Hank and Peggy; and Luanne finds a replacement dog when she thinks she has killed Ladybird.

It is revealed that Hank has a long-lost half-brother, who disowns his American relatives. Angered by this, Cotton plans to spit in the face of the Japanese Emperor Akihito at a ceremony honoring WW2 veterans later that night. As the Hill Brothers try to stop their father, they come to realize how much they have in common. Meanwhile, Bobby develops a relationship with his dance partner at the local arcade.

Vaughn and Sydney must destroy a Rambaldi artifact in order to save Will. Also, Jack makes a deal with Mr. Sark, and The Alliance decides the fate of Emily Sloane. Also, Vaughn's life is endangered when he gets locked in with a destroyed Rambaldi artifact, and Sydney comes face to face with Khasinau, and someone who she least expects.

Doggett and Reyes investigate a murder outside the house that the original Brady Bunch series was filmed in. The house is owned by a man named Oliver who is obsessed with the show and has rigged the house into a series of traps and changing appearances to look like the Brady house.

Nate and Brenda seek advice from Rabbi Ari, who leads them to a more honest place in their relationship. Ruth's need to control the lives of Nikolai and Claire help her realize that she may be the one who needs assistance. When Federico gets suspicious about an elderly woman's "natural" death, he inadvertently places Vanessa under scrutiny. A disgruntled former client files a lawsuit against Fisher & Sons, masterminded by an old friend over at Kroehner's.

For his birthday, Melanie and Lindsay take Justin to a violin recital, where he meets a sexy new guy.

Tiff Needell test drives a MG-FT. Quentin Wilson Talks about how different people try to get away from speeding tickets caught by speed cameras. Adrian Simpson test drives a modern remake of Triumph TR5. Vicki Butler-Henderson races around in the "Lo Cost" racing series, Finished 14th. Tom Ford test drives VW Polo, Seat Ibiza, and the Ford Fiesta.

An abortion doctor and her daughter are killed by a bomb placed by Mary Kane, an American "pro-life" terrorist. An informant reveals that this is just the tip of the iceberg as 20 bombs have gone missing. Kane has started training more pro-life groups within the UK and is planning more attacks. Meanwhile, Tom struggles with issues of duplicity and juggling two identities.