CREATE TABLE table_24159 ("DVD Name" CLOB, "Episodes" FLOAT, "Region 1" CLOB, "Region 2" CLOB, "Region 4" CLOB)

When was Season Three premiered in region 2?
SELECT "Region 2" FROM table_24159 WHERE "DVD Name" = 'Season Three'
SELECT "Region 2" FROM "table_24159" WHERE "DVD Name" = 'Season Three'