CREATE TABLE table_16466 ("No. in season" FLOAT, "No. in series" FLOAT, "Title" CLOB, "Directed by" CLOB, "Written by" CLOB, "Original air date" CLOB, "U.S. viewers  ( million ) " CLOB)

Which episode in the series drew 3.6 million U.S. viewers?
SELECT MIN("No. in series") FROM table_16466 WHERE "U.S. viewers (million)" = '3.6'
SELECT MIN("No. in series") FROM "table_16466" WHERE "U.S. viewers (million)" = '3.6'