Who directed the episode that had 0.57 million U.S. viewers? 
CREATE TABLE table_26914076_4 (directed_by VARCHAR, us_viewers__millions_ VARCHAR)
SELECT directed_by FROM table_26914076_4 WHERE us_viewers__millions_ = "0.57"
### Context: CREATE TABLE table_26914076_4 (directed_by VARCHAR, us_viewers__millions_ VARCHAR) ### Question: Who directed the episode that had 0.57 million U.S. viewers?  ### Answer: SELECT directed_by FROM table_26914076_4 WHERE us_viewers__millions_ = "0.57"