Table schema:
CREATE TABLE table_26259391_1 (no_in_series VARCHAR, us_viewers__million_ VARCHAR, directed_by VARCHAR)

Question: how many series had 6.55 u.s. viewers (million) and were directed by pete michels
SQL: SELECT COUNT(no_in_series) FROM table_26259391_1 WHERE us_viewers__million_ = "6.55" AND directed_by = "Pete Michels"