You want the classics, you got 'em with these (2) 1964 Marvel The Avengers original first series issues. Both of these super-keys are encapsulated by CGC, with #4 coverless (NG, Off-White Pages), and #8 (3.5, Cream to Off-White Pages) Qualified grade.
Defrosted after many years in deep freeze, Captain America triumphantly returned to the Marvel Universe to take his place with The Avengers, making his first Silver Age appearance in the offered issue #4.
Kang's time-hopping, multi-identity history is long, complex, and heavy in the peril department for Marvel's comic book, television and movie super-heroes. The offered Avengers #8 issue marks his first appearance as Kang the Conqueror.
Label notes for Avengers #4 are "Stan Lee story, Jack Kirby and George Roussos cover and art. 1st Silver Age appearance of Captain America (Steve Rogers). Sub-Mariner appearance."
Label notes for Avengers #8 are "Page 9 Missing. Stan Lee story, Jack Kirby and Dick Ayers cover and art. 1st appearance of Kang the Conqueror." CGC's website notes cite the missing Page 9 does not affect the story.
Opening Bid $150.