8 22 2015-04-23 Wolowitz questions his engineering abilities when he and Sheldon can’t get a toy drone to fly. Meanwhile, a cancelled flight nearly prevents Leonard from giving the commencement address at his former high school, and Raj pits his parents against each other when his father cuts him off financially. 5173430 20866 https://artworks.thetvdb.com/banners/episodes/80379/5173430.jpg false