Shelby Eisenberg (Earth 2)

Shelby Eisenberg, more commonly known as Black Siren, is a notorious time-traveling criminal, and a resident of the planet Earth 2. She is very different from her mainstream counterpart, and will do anything to defeat the Time Heroes Association. Unlike her other self, Shelby never had a friend called Cyd. It is heavily implied, in fact, that Cyd does not even exist where she is from. Orphaned at the age of 13, Shelby murdered her two little brothers and became evil. She joined forces with a man known as Renny (possibly Naldo) to find a way to get her father back. Sending Renny to murder Jonas Stephen Scott, the mastermind "head" of superhumans, Shelby murdered her Earth 1 counterpart via heavy drugging and draining her life energy, so she could keep a firm eye on Cyd. Upon Cyd's death, Shelby found the BSSSD was at a weak point, and successfully shrank them. The team gathered to kill Shelby, but only succeeded in majorly disabling her. Shelby vowed revenge, and then went off into hiding.