CREATE TABLE table_24570 ("Season" FLOAT, "Network" TEXT, "Timeslot" TEXT, "Season premiere" TEXT, "Season finale" TEXT, "TV season" TEXT, "Rank Rank denotes the relative position of the television series with respect to other prime time shows on the CW ,  FOX ,  NBC ,  CBS ,  and ABC." TEXT, "Viewers in millions" TEXT, "Rating Rating is the percentage of all households tuned into the program." TEXT)

What season had 2.52 million viewers?
SELECT "TV season" FROM table_24570 WHERE "Viewers in millions" = '2.52'
SELECT "TV season" FROM "table_24570" WHERE "Viewers in millions" = '2.52'