In addition to these relatives , he had a supervillain clone known as Inertia .
On his mother 's side , he is a descendant of supervillains Professor Zoom and Cobalt Blue as well as the half - brother of Owen Mercer , the second Captain Boomerang .
In addition to these relatives , descendant had a supervillain clone known as Inertia .
On his mother 's side , he is a descendant of supervillains Professor Zoom and Cobalt Blue as well as the half - brother of Owen Mercer , the second Captain Boomerang .