table: 1-11111116-8
columns: No. in season, No. in series, Title, Directed by, Written by, Original air date, U.S. viewers (million)
Q: How many millions of U.S. viewers watched the episode that first aired on March 31, 2013?
A: SELECT U.S. viewers (million) FROM 1-11111116-8 WHERE Original air date = 'March 31, 2013'