CREATE TABLE table_76530 ("Show" TEXT, "Last Aired" FLOAT, "Previous Network" TEXT, "Retitled as/Same" TEXT, "New/Returning/Same Network" TEXT, "Returning" TEXT)

What was the earliest aired show that's returning on September 13?
SELECT MIN("Last Aired") FROM table_76530 WHERE "Returning" = 'september 13'
SELECT MIN("Last Aired") FROM "table_76530" WHERE "Returning" = 'september 13'