CREATE TABLE table_28518 ("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  ( million ) " CLOB)

how many series have production code 8acx05
SELECT "No. in series" FROM table_28518 WHERE "Production code" = '8ACX05'
SELECT "No. in series" FROM "table_28518" WHERE "Production code" = '8ACX05'