CREATE TABLE table_26914076_4 (directed_by VARCHAR2, us_viewers__millions_ VARCHAR2)

Who directed the episode that had 0.54 million U.S. viewers?
SELECT directed_by FROM table_26914076_4 WHERE us_viewers__millions_ = "0.54"
SELECT "directed_by" FROM "table_26914076_4" WHERE "0.54" = "us_viewers__millions_"