CREATE TABLE table_26198709_1 (written_by VARCHAR2, us_viewers__million_ VARCHAR2)

Who wrote the episode with 18.07 million viewers?
SELECT written_by FROM table_26198709_1 WHERE us_viewers__million_ = "18.07"
SELECT "written_by" FROM "table_26198709_1" WHERE "18.07" = "us_viewers__million_"