Guest Star: Piper Mackenzie Harris
You are viewing a list of Piper Mackenzie Harris's 1 appearance on The Big Bang Theory.
Season 6, Episode 18 - The Contractual Obligation Implementation
Aired March 7, 2013
Leonard, Sheldon and Howard visit Howard's old school to speak to junior high girls about careers in science. Meanwhile, Raj plans his first formal date with Lucy, while the girls visit Disneyland and dress up as Disney princesses.
Appeared as Girl #1