CREATE TABLE table_19897294_11 (no_in_season VARCHAR2, no_in_series VARCHAR2)

What episode in the season was episode us18 in the series?
SELECT COUNT(no_in_season) FROM table_19897294_11 WHERE no_in_series = "US18"
SELECT COUNT("no_in_season") FROM "table_19897294_11" WHERE "US18" = "no_in_series"