Collecting Avengers (1963) #129-135, Giant-Size Avengers (1974) #2-4 and material from FOOM #12.
*THE CELESTIAL MADONNA IS HERE!
Prepare yourself for one of the greatest sagas in Avengers' history – the Celestial Madonna! Throughout his Avengers' run, Steve Englehart slowly built the mysterious Mantis into one of the '70s most intriguing characters. Here, her tale reaches its cosmic climax in a series of adventures spanning space and time!
When Kang the Conqueror arrives on the scene the action begins, and before it's over Hawkeye will return, an Avenger will die, the Legion of the Unliving shall rise, and Kang, Rama-Tut and Immortus will have time-twisted you in two! And that's just for starters! We also have the origin of the Vision and the android Avenger's wedding to the Scarlet Witch. They're Marvel Masterworks, one and all! *Source: marvel.com