CREATE TABLE table_662 ("No. in series" FLOAT, "No. in season" FLOAT, "Title" CLOB, "Directed by" CLOB, "Written by" CLOB, "Original air date" CLOB, "U.S. viewers  ( million ) " CLOB)

How many episodes were seen by 0.67 million US viewers on their original air dates?
SELECT COUNT("Original air date") FROM table_662 WHERE "U.S. viewers (million)" = '0.67'
SELECT COUNT("Original air date") FROM "table_662" WHERE "U.S. viewers (million)" = '0.67'