Red X

Red X (voiced by Scott Menville) is a masked anti-hero and thief.

Robin once disguised himself as Red X to get closer to Slade. But he feared that if his teammates knew about his plans, they wouldn't play their parts convincingly. So he decided not to tell them. But his plan backfired. So Robin decided never to use the Red X suit again.

But eventually, a unknown culprit managed to get the suit and become the new Red X.