Avengers (1963) #69-71 l 33

Kang kidnaps the team in order to ask them for help. See, this dude called the Grandmaster has challenged him to a cosmic game and he needs our heroes to be his pawns. So they help the guy, face off against the Squadron Sinister and the 1940's Invaders, then when all is said and done, Kang tries to kill them. Typical Kang.