At the end of the last season, Leonard (Johnny Galecki) and Penny (Kaley Cuoco) announced their engagement. They discussed with Sheldon (Jim Parsons) about moving out of the apartment. His girlfriend Amy suggested that Sheldon live with her, which scared Sheldon. At the same time, their favorite comic book store was burned down. Sheldon could not accept the changes in his life for a while and left in anger. More than a month has passed. What will Sheldon encounter in this journey across the American continent? In the new season, the lives of several other protagonists have also changed. Penny gave up her acting career and officially embarked on the road of drug sales. She and Bernadette will become colleagues. Howard's biggest worry is that his mother lives with Stuart, the owner of the comic book store. When will the bachelor Rajesh find a girlfriend?