 Partially based on the Marvel comic The Ultimates. The plot is a  truncated version of the first two story arcs in the Volume 1  series. The characters of Thor, Hulk, and General Fury are watered  down versions of the Ultimates comic book characters of the same  name. Captain America, Jarvis, Wasp, Giant Man and Iron Man in this  cartoon are adapted from the Avengers comic books, as well as Iron  Man, Captain America, and Tales to Astonish, published from the  1960s to the early 21st century.