CREATE TABLE table_21726 ("Series #" FLOAT, "Episode #" FLOAT, "Title" CLOB, "Directed by" CLOB, "Written by" CLOB, "U.S. viewers  ( million ) " CLOB, "Original airdate" CLOB, "Production Code" CLOB)

Who wrote the episode 'The Dream Lover', which was viewed by 3.96 million viewers?
SELECT "Written by" FROM table_21726 WHERE "U.S. viewers (million)" = '3.96'
SELECT "Written by" FROM "table_21726" WHERE "U.S. viewers (million)" = '3.96'