Because Harry cant stop doing his "saving people thing" during Chitauri invasion, S.H.I.E.L.D manages to caught him in camera, and end up joining the Avengers under the codename of Mage. somewhat following Marvel Cinematic Universe, but definitely diverges after Age of Ultron. even before that, we got new members joining in, like Spider-Man and Squirrel Girl. a bit long read, but its worth it
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Because Harry cant stop doing his "saving people thing" during Chitauri invasion, S.H.I.E.L.D manages to caught him in camera, and end up joining the Avengers under the codename of Mage. somewhat following Marvel Cinematic Universe, but definitely diverges after Age of Ultron. even before that, we got new members joining in, like Spider-Man and Squirrel Girl. a bit long read, but its worth it