Question: What date did the episode written by Mitch Watson and directed by Curt Geda originally air in the U.S.?
Schema: create table table_28511558_2 (original_air_date__us_ varchar, directed_by varchar, written_by varchar, PRIMARY KEY (original_air_date__us_))
SQL: select original_air_date__us_ from table_28511558_2 where directed_by = "curt geda" and written_by = "mitch watson"