Lonely Professor Frink uses science to turn himself into a man whom women find attractive. Then, overwhelmed by the attention, he invents an algorithm to perfectly pair the lonely men and women of Springfield, realizing that scientific exploration is his true love. Meanwhile, Marge, Bart, and Lisa visit Grampa for Valentine's Day and try to rescue the old folks from a drug-induced hallucination that allows them to relive their happiest memories.

Lisa and Homer's bond gets stronger when they start spending real quality time together, and Bart feels neglected. So Marge tries to help Homer balance his attention between the kids.

Bart bonds with Ned Flanders, which leaves Homer jealous, so he retaliates by mentoring Nelson Muntz; a heroic act by Homer makes Bart look up to him again.

Lisa calls her teacher, Ms. Hoover, a hack and refuses to apologize. Then, she learns Ms. Hoover's private pain.

Bart can't control his feelings when he gets a new teacher. Meanwhile, Lisa befriends an octopus.

Lisa gets called for jury duty while Marge becomes obsessed with her exercise bike.

Lisa has a blazing misadventure in the dark world of Capital City's downtown art scene.