user: Question: Name who directed the episode that was viewed by 4.22 million
Columns: ['No. in series', 'Title', 'Directed by', 'Written by', 'Original air date', 'Production code', 'U.S. viewers (million)']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, '" Pilot "', 'David Nutter', 'Eric Kripke', 'September13,2005', '475285', '5.69']
SQL:

assistant: SELECT "Directed by" FROM "Table" WHERE "U.S. viewers (million)" = '4.22';