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Leonard and Sheldon go to great lengths to secure the helium they need during a nation-wide shortage; Bernadette and Penny try to find Amy a new man on a dating app.

Sheldon struggles to keep his emotions in check when he is interviewed for a documentary about Spock; Penny and Leonard make a surprising discovery; Wolowitz and Bernadette get into a disagreement about remodeling his childhood home.

Ann sets Leslie up on a blind date; one of Ann's old friends makes Mark feel insecure.

Following a date with Justin in Indianapolis, Leslie hosts a dinner party at her house to try to impress him.

Leslie objects to a deal the Parks Department forms with a local company to sell energy bars in Pawnee; Mark agrees to help Tom move.

Leslie and Justin reunite her mother with an old flame for Valentine's Day; Andy's band is nervous about playing a gig at the Senior Center.

Ron wins an award for a project that Leslie began; Tom needs to find money to invest in a local Pawnee club.

Leslie must catch a possum that bit the mayor's dog; Mark refuses to bend the rules for Ron.