Leonard is selling his share of the time machine and everyone is giving him offers below what he paid due to depreciation. He is also selling the rest of his collectibles and his friends argue and bid over the price.

Sheldon and Leonard are playing 3D chess which is a sequential game.

Raj and Sheldon partake in a series of juvenile tit-for-tat exchanges.

Billy is replaced by "Bobby" after having a falling out with Mandy. While initially behaving like Billy, Bobby reveals himself to be a malicious usurper of other people's lives. He appears to Billy and threatens to get rid of him forever unless he disappears in 24 hours. Billy comes up with a strategy to get rid of Bobby, instead, and tricks him into getting pushed into an interdimensional portal.

Leonard bids on a movie prop and ends up winning. He pays the amount he bid so this is a first-price auction.