Avengers #133 (1975)

"Yesterday and Beyond…" Script by Steve Englehart. Art by Sal Buscema (layouts) and Joe Staton (finishes). Cover by Gil Kane, Dave Cockrum, and Frank Giacoia.

As a reward for thwarting the Kang the Conqueror, Immortus sends Mantis and the Vision on separate journeys through time to discover their respective origins. The Vision's path of discovery starts in the laboratory of Dr. Phineas T. Horton during the early days of World War II. While Mantis' history lesson begins eons ago on Hala, the home planet of the Kree. Meanwhile inside Avengers Mansion, the Scarlet Witch trains with Agatha Harkness to hone her mutant powers.

Key book; origin of the Vision, origin of Mantis, origin of the Kree-Skrull War, first appearance of The Cotati. Good condition.