Hundreds of profiles of heroes and villains, and teams of heroes and villains, who have been in Avengers comics over the decades. Many of the characters are obscure. Includes "key storylines": summaries of memorable or major stories in the Avengers comics. Pretty good art.
Notes
The Avengers originated when Loki sought vengeance on Thor. 1st 18 issues were dominated by Thor, Iron Man, Giant-Man, Wasp. In 4th issue, Captain America was thawed from ice and presided over team including 2 outcast mutants (Quicksilver and Scarlet Witch) and reformed supervillain Hawkeye. Later Black panther and Vision became Avengers.
Black Widow received physical enhancements from a copy of the Super-Soldier serum.
Nick Fury led the Howling Commandos in World War II. At the end of the war, he received a dose of Infinity Formula which kept him youthful and strong. Fury's eye was damaged in World War II.
The Vision's body once belonged to the android Human Torch, but was redesigned as part of Ultron's plan to defeat the Avengers.
Thanos is "personally powerful enough to defeat the Avengers single-handedly."
Inhumans were created 25,000 years ago when Kree performed genetic experimentation on primitive people on Earth.