The animation production company for this feature is MADHOUSE who's responsible for the 1993 anima cult classic Ninja Scroll.
At the Leviathan auction being held in Madripoor, the following super villains are in attendance (in order of appearance): Baron Zemo, Count Nefaria, Taskmaster, Graviton, Grim Reaper and Griffin.
Carol Danvers/Captain Marvel makes four cameos, the first together with Iron Man, Thor and War Machine, the second flying, the third fighting together with his partners and the fourth appears in the ending credits, but she never talking.
This feature takes place in the Earth-101001 version of the Marvel Universe, together with the Marvel Anime (2010) series and Iron Man: Surge el Tecnívoro (2013).
Released in the year for the 50th Anniversary of Natasha Romanoff/Black Widow and the 40th Anniversary of The Punisher.