Frank Miller's comic "The Dark Knight Strikes Again" is... weird. Both the plot and art style - continued from his iconic work "The Dark Knight Returns" - is expected to be somewhat off-wall, but he outdid himself with the sequel. That said, the third act of the series takes a decidedly strange turn, with several twists & plot points coming seemingly out of nowhere.
Batman himself seems out-of-character, as does Superman. Most other characters fade into the background despite strong, ongoing appearances throughout the rest of the book, and the dialogue seems like random gibberish at times. The art style gets noticeably messier, and the plot itself takes a similarly chaotic turn. The change is visible enough that, in my opinion, it's like watching one of those "artists with Alzheimer's" photo galleries.
There have been rumors of both drug and alcohol abuse on the part of Miller, although I couldn't find anything concrete. The closest thing I could find was speculation from WIRED that Miller was suffering from a form of PTSD following the 9/11 attacks in New York.
Was Frank Miller under the influence of drugs and/or health issues while writing Book 3 of "The Dark Knight Strikes Again", or was the chaotic ending intentional?