Immortus rarely appeared for several years after his initial introduction but then in 1974’s Giant-Size Avengers #2-3, writer Steve Englehart and artist Dave Cockrum firmly established the link between Rama-Tut, Kang, and Immortus with the huge reveal that all three were in fact the same man from different points in his life. In the course of this storyline, the older incarnation of Rama-Tut and the even older Immortus actually came to the aid of the Avengers.
Oh my eyes my eyes poster
Kang believed that if he took the fabled Celestial Madonna, AKA Mantis — yes, as in the Guardians of the Galaxy movie character — as his wife, then their child would conquer the universe in his name. That was an outcome that Kang’s future selves managed to prevent, with the help of the Avengers.