Thanos is back. The most powerful and terrifying supervillain in Marvel Comics is out for blood -- and the Illuminati. Specifically, the Illuminati that consists of Marvel's strongest and most mysterious heroes, working under the radar of the bolder and brighter likes of the Avengers. The Illuminati has taken something from Thanos, and the Mad Titan will do anything to get it back. The problem is that something is someone -- and that someone has no idea who she really is.
Source：https://www.cbr.com/review-marvels-thanos-1/
