Sheldon and Amy await big news. Bernadette and Wolowitz leave their kids for the first time; Penny and Leonard try to keep a secret.Koothrappali makes a new friend; the gang travels together into an uncharted future.

Cast: Johnny Galecki, Jim Parsons, Kaley Cuoco, Simon Helberg, Kunal Nayyar, Mayim Bialik, Melissa Rauch, John Ross Bowie, Blair Hickey, Rodney J. Hobbs, Joshua Malina, Alfredo Tavares, Dinora Walcott