With this issue the indicia title drops "The" and is simply "Avengers". The advertising insert adds four pages to the magazine.
This issue is a variant of The Avengers (Marvel, 1963 series) #307 [Direct].
There exist further variants:
The Avengers [Captain America [Steve Rogers]; Quasar [Wendell Vaughn]; Thor [Sigurd Jarlson]; She-Hulk [Jennifer Walters]; Namor the Sub-Mariner; Black Panther [T'Challa]; Gilgamesh]; Fantastic Four [Invisible Woman; Mister Fantastic]; Wonder Man [Simon Williams]; Edwin Jarvis; Jinku (villain); Lava Men [Akor (introduction); Danka (introduction); Kelak (introduction)]; Avenging Avatar of Cha'Sa'Dra (villain)
Synopsis
The Avengers battle Jinku and his Avatar of Cha'Sa'Dra. The Lava Men, thought turned into statues, emerge from these rocky forms transformed into golden-skinned Lava Men and end the battle. Gilgamesh is badly injured in the battle.