The last from the comics to be added to "Smallville" will be Kal-El's cousin Kara, who will added to the cast. I have only seen the Green Arrow episodes for obvious reasons, so I don't know what's going on now. I have pretty much stop watching. The role has not be casted yet. She will have more powers than Clark--she can actually fly and connect him more to Krypton. On the Animated Series of Superman, Kara was added as a cameo character and later became a integral part of "Justice League Unlimited". During the 90's, to attract more comic book readers, more complicated storylines were made for Supergirl--who first died in the first generation.