CREATE TABLE table_28694 ("No. in series" FLOAT, "No. in season" FLOAT, "Title" CLOB, "Directed by" CLOB, "Written by" CLOB, "Original air date" CLOB, "Production code" CLOB, "U.S. viewers  ( millions ) " CLOB)

How many millions of US viewers watched 'Helen Back Again'?
SELECT "U.S. viewers (millions)" FROM table_28694 WHERE "Title" = 'Helen Back Again'
SELECT "U.S. viewers (millions)" FROM "table_28694" WHERE "Title" = 'Helen Back Again'