CREATE TABLE table_3435 ("Series #" FLOAT, "Season #" FLOAT, "Title" CLOB, "Director" CLOB, "Writer ( s ) " CLOB, "Airdate" CLOB)

Who directed the episode that aired on February 19, 1968?
SELECT "Director" FROM table_3435 WHERE "Airdate" = 'February 19, 1968'
SELECT "Director" FROM "table_3435" WHERE "Airdate" = 'February 19, 1968'