Red X

A mysterious super-thief known as Red X arrived in town trying to steal a high-tech computer ship. And Red X somehow knew just how to disarm each of the Teen Titans. Red X was actually Robin is disguise; He assumed the identity of Red X in an attempt to learn more about his arch-foe, Slade. But the plan backfired, and Robin almost lost the trust of his friends.

Later, Red X mysteriously resurfaced. Someone had stolen the super-suit from Robin's safekeeping. Red X sought Xenothium - the rare dangerous chemical that powers the suit. After Robin and Red X were both double-crossed by the evil Professor Chang, they teamed up to bring him down and rescue the Titans. Robin was able to steal the belt that powered the suit before Red X made his escape.

When Robin's most prized possession was stolen by the hip hot-rodder Ding Dong Daddy, he had beat him in a cross-country road race to get it back. Red X joined the race in an attempt to secure Robin's prize and auction it off to the highest bidder. But when Robin saved Red X's life, the mysterious super-thief sabotaged Robin's competitors, enabled the teen wonder to win the race.

Neither good nor evil, Red X's motivations and identity remain a mystery