CREATE TABLE table_31325 ("Series #" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Production code" TEXT, "U.S. viewers  ( million ) " TEXT)

What is the series # when the director is john showalter?
SELECT "Series #" FROM table_31325 WHERE "Directed by" = 'John Showalter'
SELECT "Series #" FROM "table_31325" WHERE "Directed by" = 'John Showalter'