user: Question: How many millions of US viewers watched "Helen Back Again"?
Columns: ['No. in series', 'No. in season', 'Title', 'Directed by', 'Written by', 'Original air date', 'Production code', 'U.S. viewers (millions)']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [20.0, 1.0, '"Beggin\' on Your Knees"', 'Steve Hoefer', 'Jake Farrow', 'April2,2011', '209', '6.2']
SQL:

assistant: SELECT "U.S. viewers (millions)" FROM "Table" WHERE "Title" = '"Helen Back Again"';