Virus X

Virus X is a fictional illness featured in comic book titles published by DC Comics. It is part of DC's Pre-Crisis Earth-One continuity and first appeared in the "When Kryptonians Clash" story from Superman, Volume 1 #365. The concept of was created by writer Cary Bates and artists Curt Swan and artists Curt Swan and Frank Chiaramonte.

Virus X was an artificially created radiation-based illness developed by an alien member of the Superman Revenge Squad known as Blymm. Blymm infected Superman's colleague, Supergirl with the virus, which forced her to act violent and irrational. After a heated confrontation with Superman, the Man of Steel was able to cure Supergirl of the affliction with a healthy dose of White kryptonite.