Question: Name the region 1 where region 4 for April 2, 2009
SQL: SELECT "Region 1" FROM "1-171320-3" WHERE "Region 4" = 'April 2, 2009';

Question: Name the region 1 for episode number 13
SQL: SELECT "Region 1" FROM "1-171320-3" WHERE "Ep #" = 13.0;