Sheldon butts heads with Dr. Lee, a new scientist in the lab. Also, Mary is given a lotto ticket.
'Young Sheldon' looks back on the early life of Sheldon Cooper before the events of 'The Big Bang Theory', when he was simply a nine-year-old genius living with his family in East Texas. Sheldon skips fourth grade and heads directly to high school, much to his siblings' chagrin.