CREATE TABLE table_30751 ("No. in series" FLOAT, "No. in season" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Production code" TEXT, "U.S. viewers  ( million ) " TEXT)

What date did the episode that had 8.84 million u.s. viewers originally air?
SELECT "Original air date" FROM table_30751 WHERE "U.S. viewers (million)" = '8.84'
SELECT "Original air date" FROM "table_30751" WHERE "U.S. viewers (million)" = '8.84'