This Batman Beyond #21 comic book is a must-have for any superhero fan. Featuring the first appearance of Justice League Unlimited and being the first printing, this issue is in near mint condition with a grade of 9.4. The story title is "In Blackest Day" and it was written by Hilary J. Bader and illustrated by Rick Burchett. The cover was also done by Rick Burchett and the comic is in English.

It is a single issue format that is boarded and comes in a Gemini Box. The intended audience is children and young adults, but it is also great for collectors as it is vintage, having been published in 2001 in the Modern Age (1992-Now) era. The comic book is part of the Batman Beyond series title and the DC Universe. It belongs to the action, superheroes, adventure, movie & TV, and cartoon genres.