Sophie Oda

In the first part of the one-hour seventh season premiere, Sheldon and Penny bond in Leonard's absence, but it's Sheldon's feelings that are crushed when Leonard returns from the North Sea. Guest star Regina King returns as Mrs. Davis, the University's Director of Employee Relations.

Zack launches a scheme to salvage the discarded personal items of a popular singer (Jesse McCartney).

Cody is graduating top of the class, but Zack has done badly and must attend summer school.

Zack and Cody use a sophisticated boy to impress their dates; Maddie finds a cell phone and imagines its owner.

London, Cody and the gang decide to form their own cheerleading squad.

Cody thinks a new violinist is flirting with his girlfriend; London tries to learn about the hotel business.