Avengers: The Enemy Within (2013) #1

THE OPENING SALVO TO THE HOTLY ANTICIPATED AVENGERS/CAPTAIN MARVEL FOUR PART EVENT! Can't keep a good Captain down! Vicious echoes of the Avengers' past are cropping up all over Manhattan...and a grounded Captain Marvel refuses to be left behind. Who is the sinister figure behind these incursions and what does it have to do with Carol Danvers' mysterious condition? But is this villain real or just a figment of Captain Marvel's increasingly deadly imagination?