User blog comment:ScarletWhisper/No Red Hood In Season 2/@comment-124.197.39.62-20121027214120/@comment-1038387-20121107211803

Of course they know who Jason Todd is. He's the one who dies in Sarajevo in the beginning, and is then revived in a Lazarus Pit and returns hom to haunt his former mentor. He's the most important character in the movie.

You don't need extensive comic book knowledge, not even basic comic book knowledge, to understand and/or like the film.