Acts of Vengeance was a company-wide fall crossover that was centered on the Avengers and Fantastic Four. After three consecutive fall crossovers were built around the X-Men and related mutant teams, promotional materials teased the idea of a wide array of super-villains facing heroes they had never met (or at least were villains that weren’t part of the heroes’ regular gallery).
The core titles of the crossover include Avengers; Avengers Spotlight; Avengers West Coast; Captain America; Iron Man; Quasar; Thor; and Fantastic Four. Major tie-ins included The Amazing Spider-Man among other Spider-Man titles, Uncanny X-Men and the second Damage Control limited series. An epilogue features in Cloak and Dagger; Web Of Spider-Man and in an Avengers Annual.
The New Warriors first appeared in this issue of The Mighty Thor (v.1 #412, 1989) The team was compiled by writer/editor Tom DeFalco, consisting of the young superheroes Firestar, Marvel Boy, Namorita, Nova and Speedball, all of whom were once featured in solo series or were supporting characters in more established series. To this mix DeFalco added Night Thrasher, an original character to serve as the team’s founder and leader. The New Warriors were not sidekicks, as some prior teen superhero teams had been.
From: The Mighty Thor V1 #412 (1989)