CREATE TABLE table_60803 ("Episode" TEXT, "1 season" TEXT, "2 season" TEXT, "3 season" TEXT, "4 season" TEXT, "5 season" TEXT, "6 season" TEXT)

What is 4 Season, when 2 Season is '3 168 673 (2 April 2008)'?
SELECT "4 season" FROM table_60803 WHERE "2 season" = '3 168 673 (2 april 2008)'
SELECT "4 season" FROM "table_60803" WHERE "2 season" = '3 168 673 (2 april 2008)'