Phil and Claire decide to break with their usual Valentine's dinner date and opt for a role play excursion; Jay and Gloria clash over ideas for romance.
Phil invites his old high school girlfriend over; Jay accidentally kills Manny's pet turtle and tries to cover his tracks; Mitchell stands up to his boss.
Sheldon decides to invite the people from his school to attend a Nobel Prize announcements party; Meemaw discovers more details about Dr. Sturgis' past.
Sheldon takes personal action when Meemaw won't take him to a lecture with Dr. Linkletter; Georgie attempts to impress Veronica with a business venture.
Joey's fridge is broken and he tries to cajole his friends into helping him buy a new one; Phoebe, Monica and Chandler compete to get Rachel a date for a ball.
Ross asks his friends to keep him company when he meets Elizabeth's dad for the first time; Joey may get fired when he fights with C.H.E.E.S.E's operator.
Chandler tries to make Monica think he doesn't want to get married in an attempt to surprise her with the ring; Richard proposes to Monica at her work.
Planning for the wedding begins; Phoebe moves in with Ross, bringing her massage parlor with her; Monica's parents spend the wedding money on a beach house.
Leonard learns he can only bring one guest with him on a Valentine's Day trip to see the Hadron Collider, forcing him to choose between Sheldon and Penny.
When the guys happen upon an actual prop from "The Lord of the Rings" movie trilogy, the desire to possess the object threatens to tear apart their friendship.
Sheldon and Leonard get invited to a big party at Wil Wheaton's house, causing Leonard to choose the party or his friend; Howard gets a huge opportunity.
Sheldon's attempt at spontaneity brings unexpected friction between Penny, Amy, and Bernadette: Raj turns to Howard for help in preparing for a date with Emily.
Everybody works together to ensure everything goes according to plan when Amy's parents and Sheldon's family arrive, but the bride and groom have other plans.
Leonard and Amy retrieve Sheldon from Arizona; Penny is interviewed for a job at Bernadette's office; Howard is disturbed by Stuart and Mrs. Wolowitz's link.
NASA invites Wolowitz to throw the first pitch at a Los Angeles Angels game; Leonard and Penny try to disprove Sheldon's claim that he and Amy are "superior."
Raj comes clean to Emily about his history after his girlfriend acts callous towards Penny; the guys contemplate sharing ownership of Stuart's comic book shop.
Claire gets Phil to agree to sell the old family station wagon; Mitchell decides to build a princess castle for Lily; Manny invites a girl over to study.
Carl wants Eddie to pursue a career as a professional basketball star, and he convinces a player from the National Basketball Association to visit the house.