CREATE TABLE table_18335117_5 (original_air_date VARCHAR, director VARCHAR, writer VARCHAR)

Name the original air date for barnaby southcomb for charlie martin
SELECT original_air_date FROM table_18335117_5 WHERE director = "Barnaby Southcomb" AND writer = "Charlie Martin"
SELECT "original_air_date" FROM "table_18335117_5" WHERE "Barnaby Southcomb" = "director" AND "Charlie Martin" = "writer"