Red X is a mysterious thief with a unique connection to Robin and the Teen Titans. Originally, Robin created the identity of Red X to go undercover and get closer to Slade. However, Robin didn't share his plan with his teammates, causing a breach of trust between them when Red X's identity was revealed. The costume would eventually be stolen by a mysterious thief who became the new Red X, an enemy of Robin and the Titans alike.
Red X (Robin's disguise) debuted in the Teen Titans TV series episode Masks (2003), written by Thomas Pugsley and Greg Klein. Red X (as a separate character) debuted in the episode X (2004), created by Ben Jones and David Slack. He was first mentioned in mainstream comics in Terror Titans #2 (2009). However, Red X only made his first physical appearance in Future State: Teen Titans #1 (2021) as part of the possible future event Future State. The character was adapted by Tim Sheridan and Rafa Sandoval.
Multiverse
New Earth
Modern Age
Possible Futures
Teen Titans TV Series Multiverse
Teen Titans (TV Series)
Successor
Teen Titans (TV Series)
Comics-only chibi version
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Teen Titans Go! (TV Series)
2013 reboot