Leonard and Penny deal with the idea of starting a relationship again and Raj finally finds a "woman" he can talk to without being drunk, in the form of Siri on his new phone. Meanwhile, Sheldon decides to start a YouTube series entitled "Sheldon Cooper presents Fun with Flags" with the help of Amy.
Elenco: Jim Parsons , Johnny Galecki , Kaley Cuoco , Simon Helberg , Kunal Nayyar , Mayim Bialik , Melissa Rauch , Kevin Sussman , Aarti Mann , Kevin Sussman , Sara Gilbert .