CREATE TABLE table_3584 ("No. in series" FLOAT, "No. in season" FLOAT, "Title" CLOB, "Directed by" CLOB, "Written by" CLOB, "Original air date" CLOB, "U.S. viewers  ( millions ) " CLOB)

when did 14.55 people watch?
SELECT "Original air date" FROM table_3584 WHERE "U.S. viewers (millions)" = '14.55'
SELECT "Original air date" FROM "table_3584" WHERE "U.S. viewers (millions)" = '14.55'