CREATE TABLE table_28241 ("No. in series" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Production code" TEXT, "U.S. viewers  ( million ) " TEXT)

Which episode did 18.74 million people tune in?
SELECT "Title" FROM table_28241 WHERE "U.S. viewers (million)" = '18.74'
SELECT "Title" FROM "table_28241" WHERE "U.S. viewers (million)" = '18.74'