CREATE TABLE table_30413 ("No. in Series" FLOAT, "No. in Season" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "U.S. viewers  ( millions ) " TEXT, "Original air date" TEXT)

How many episodes had 11.86 million US viewers?
SELECT COUNT("No. in Series") FROM table_30413 WHERE "U.S. viewers (millions)" = '11.86'
SELECT COUNT("No. in Series") FROM "table_30413" WHERE "U.S. viewers (millions)" = '11.86'