Jason Todd was the second Robin and protégé of Batman after Dick Grayson left Gotham for Jump City and formed the Teen Titans. Jason was killed by The Joker a year prior to the events of FusionFall.
It has been speculated by fans that Jason may be Red X, as he appeared as a candidate on Beast Boy's theory table of people who could possibly be Red X. This was later poked fun at in the New Teen Titans short "Red X Unmasked."
Community content is available under CC-BY-SA unless otherwise noted.