Avengers (1963) #135-136 and Giant Size Avengers (1974) #4 l 59

Could this possibly be the end to the Celestial Madonna saga? Let's just say it goes out in spectacular fashion. Vision and Scarlet Witch get married. Mantis marries a tree, becomes an official member, then disappears. Plus we get surprise appearances from Dormammu, Kang, and the Space Phantom. It's truly magical.