CREATE TABLE table_25555 ("No." FLOAT, "#" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "U.S. viewers  ( million ) " TEXT, "Rank  ( week ) " FLOAT, "Original air date" TEXT)

List the original air date for week 5.
SELECT "Original air date" FROM table_25555 WHERE "Rank (week)" = '5'
SELECT "Original air date" FROM "table_25555" WHERE "Rank (week)" = '5'