CREATE TABLE table_72938 ("Season" TEXT, "Date Released" TEXT, "# Of Episodes" FLOAT, "# Of Discs" FLOAT, "Special Features" TEXT)

What day was the complete 2nd series: volume one released?
SELECT "Date Released" FROM table_72938 WHERE "Season" = 'The Complete 2nd Series: Volume One'
SELECT "Date Released" FROM "table_72938" WHERE "Season" = 'The Complete 2nd Series: Volume One'