CREATE TABLE table_27558 ("No. in series" FLOAT, "Title" CLOB, "Directed by" CLOB, "Written by" CLOB, "Original air date" CLOB, "U.S. viewers  ( million ) " CLOB)

How many episodes were directed by Michael McCullers?
SELECT COUNT("Original air date") FROM table_27558 WHERE "Directed by" = 'Michael McCullers'
SELECT COUNT("Original air date") FROM "table_27558" WHERE "Directed by" = 'Michael McCullers'