CREATE TABLE table_16619 ("No. in series" FLOAT, "Title" CLOB, "Directed by" CLOB, "Written by" CLOB, "Featured character ( s ) " CLOB, "Original air date" CLOB, "U.S. viewers  ( million ) " CLOB)

Which titles have 18.73 u.s. viewers.
SELECT "Title" FROM table_16619 WHERE "U.S. viewers (million)" = '18.73'
SELECT "Title" FROM "table_16619" WHERE "U.S. viewers (million)" = '18.73'