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

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'