Chuck Versus the Fat Lady

Chuck and Jill are enjoying the honeymoon stage of their rekindled relationship. However, Chuck's spy life interrupts when Casey and Sarah inform Chuck that he is needed for an immediate mission to recover a list of CIA Fulcrum agents that Guy LaFleur had apparently hidden in his hotel room before being murdered. Jealousy erupts when Jill finally meets Sarah and learns that Chuck and his handler must pose as a couple, especially when she learns that Sarah is posing as a seductively-dressed escort for the mission. Chuck does his best to reassure Jill that his relationship with Sarah is purely business but only finds himself in more trouble when Jill finds Chuck and Sarah in their hotel room in their underwear after trying to wash off a suspected bioweapon. Chuck desperately tries to explain the surreal situation that Jill witnessed, to which Jill responded with curiosity, revealing LaFleur's affinity to puzzles and vague references to safeguard his valuable information. The team recovers a music box in LaFleur's room, deciphering the clue with Jill's assistance, which leads them to the opera, where they recover an encrypted flash drive with the Fulcrum list. Chuck and Jill leave for a romantic getaway, during which Jill is kidnapped by a Fulcrum agent and held hostage in exchange for the list. Chuck agrees to the exchange, but first makes a copy of the list with Morgan's copying device (designed to copy video games, but apparently able to copy anything). Chuck and Jill embark on another romantic getaway, during which Sarah and Casey discover from the recovered list that Jill is a Fulcrum agent herself. The episode ends with Sarah and Casey rushing to Chuck's room only to find his watch and the next scene shows Chuck and Jill driving away with Chuck completely oblivious to her identity.

Emmett is on a personal witch hunt for Chuck. He interrogates Morgan to get some dirt, but Morgan at first refuses. When Emmett threatens the Buy More after-hours poker game Morgan gives up some information and that night at the game Emmett decides to join in. The next day, Emmett has a horrible hangover and Morgan blackmails Emmett with footage of Emmett's drunken stupor.

• Chuck flashes on the puzzle box.
• Chuck flashes on the opera glasses