Red X was initially a villainous identity Robin assumed in an attempt to get closer to the villain Slade. After being outsmarted by Slade and nearly getting himself killed, Robin locked up the Red X suit, vowing never to use it again.
Some time later, however, the suit came into the possession of an unknown culprit. This new Red X had intended to use the suit for his own financial gain, but because the chemical Xenothium powering the suit was nearly exhausted, Red X stole a Xenothium scanner to hunt for more of the substance. This eventually brings Red X into conflict with Robin and the Teen Titans.
The new Red X is a mysterious, daring enigma who delights in toying with his enemies, holding no allegiances and working to suit his own ends. Red X assumes the role of an anti-hero, and while he considers Robin to be a personal rival, he also appears to grudgingly respect him enough to aid him in times of need. He has since become a popular recurring character in the series.
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Games and Puzzles
A new vilain who calls himself "Puzzle Master" has captured Sierra and the only way the Teen Titans can find them is by seeking various clues and riddles spread all around the city.