What episode aired on 18 April 2007?
CREATE TABLE table_10749367_3 (_number INTEGER, air_date VARCHAR)
SELECT MIN(_number) FROM table_10749367_3 WHERE air_date = "18 April 2007"
### Context: CREATE TABLE table_10749367_3 (_number INTEGER, air_date VARCHAR) ### Question: What episode aired on 18 April 2007? ### Answer: SELECT MIN(_number) FROM table_10749367_3 WHERE air_date = "18 April 2007"