Penny and Sheldon design an experiment -- as a joke -- to make participants fall in love; Howard and Bernadette get into trouble at the airport.
Director:
Mark Cendrowski
Cast:
Johnny Galecki
Jim Parsons
Kaley Cuoco-Sweeting
Simon Helberg
Kunal Nayyar
Mayim Bialik
Melissa Rauch
Laura Spencer
Stephanie Escajeda
Molly Morgan