There are two Clark Kents. One is the man whose life in a tiny Kansas town sets him on destiny's path. The other is a Bizarro, a dark double who shares Clark's DNA, but not his Smallville values. Only one of them can survive. The Superman saga grows even deeper and more powerful in an event-packed season that includes the arrival of Clark's Kryptonite cousin Kara/Supergirl (Laura Vandervoort).