Rosewood and Villa continue the pursuit of a serial killer, who seems to always be one step ahead of them. Meanwhile, Capt. Hornstock is up for the Chief's position and Pippi and Tara work on their wedding invitations.moreless
When Leonard is set to give the commencement address at his former high school, a canceled flight threatens to stop him giving the speech. Meanwhile, Howard's engineering skills are tested when he and Sheldon try fix Raj's toy helicopter, while Raj plays his parents against each other after his father cuts him off financially.moreless
Red John kills again just as Jane narrows down the suspect list to seven and the victim has a connection to Jane's past.
Sheldon faces a crisis of conscience after breaking a Star Trek toy given to him by Penny. Meanwhile, a lonesome Raj is smitten after a date set up by his parents.
Penny finds the perfect girl for Raj to date. Meanwhile, Sheldon uses Dungeons & Dragons dice to make life's trivial decisions.
Sheldon is aghast to learn the new chair in Penny's apartment was someone else's garbage. Leonard and Priya try a long-distance relationship.