User blog comment:Anomymous Writes/Jason Todd on Young Justice/@comment-2111740-20120523143209/@comment-1038387-20120523155136

It was an in-joke. Beast Boy suggested origins. One of them was Jason, others were an evil twin of long lost brother of Dick, those kind of things. Either way, Red X and Jason Todd are not the same, no matter how hard you want to believe it.

And as for him showing up... not in this timeline. In the comics, Jason came along after Dick had become Nightwing (it would make no sense on YJ for him to have two Robins). Throw in a couple of years of working together. And in the comics, after Jason's death, Batman was in a really bad mood. He was violent, remorseless. Tim changed that a bit, but it took time. Seeing how Bats was a "family man" in Alienated, it just doesn't fit.