Leonard (Johnny Galecki) and Penny (Kaley Cuoco), who are already engaged, have finally decided to get married! They don't invite any relatives or friends and fly to Las Vegas for a quick wedding. On the way, Leonard confessed a secret to his fiancée, which caused a rift between them. Can Leonard and Penny, who have been running for many years and are about to get married, get married smoothly? On the other hand, Sheldon (Jim Parsons) suffered a major blow - his girlfriend Amy broke up with him. He tried to save it many times, but Amy was quite determined. Old friends such as Howard (Simon Helberg) and Raj (Kunal Nayyar) are also worried about their affairs.