Ninja High School Textbook

A short-lived, two-issue spin-off from Antarctic Press, Ninja High School Textbook (2001–2003) offers an in-universe, educational-style look at the world of Ben Dunn's long-running series. Written primarily by Ben Dunn and Herb Mallette, with Dunn on art, it presents a classroom guide to the ninja arts and the series' peculiar science, framed as a textbook for the school's students. While brief, it's a fun, meta addition for fans wanting a deeper, tongue-in-cheek dive into the lore and absurdities of the Ninja High School universe.