One of the new villains is Doomsday, who's notable for killing Superman in the DC Comics Superman universe. Another is a female villain producers describe as "intelligent, brilliantly manipulative, and dangerously sinister" whose "attraction with Clark may prove to be as deadly as kryptonite for him."The actual press release indicates she "will be familiar to many fans." Rosenbaum may be back as a guest star next season. The 7th season finale airs May 15 on The CW. Find all of the Reporter’s story on the matter here.