CREATE TABLE table_24250 ("No. in series" FLOAT, "Title" CLOB, "Directed by" CLOB, "Written by" CLOB, "Original air date" CLOB, "Production code" CLOB, "U.S. viewers  ( millions ) " CLOB)

What was the original air date of the episode that had 4.08 million U.S. viewers?
SELECT "Original air date" FROM table_24250 WHERE "U.S. viewers (millions)" = '4.08'
SELECT "Original air date" FROM "table_24250" WHERE "U.S. viewers (millions)" = '4.08'