The Avengers Vol. 1 (1963-1996) #296

Plot

With the Avengers as her helpless pawns, Kang Nebula makes her move! Ravonna (calling herself Nebula) and Earth's Mightiest Heroes depart Hydro-Base in a quinjet…and fly into the time stream! Their destination? An ominous time bubble in the present day space-time continuum! Will the Avengers be able to penetrate the magnificent time bubble? And if yes, what will they find inside? Therein lies the mystery! Meanwhile, the three Kangs from the council of Kangs follow the quinjet in hot pursuit! Will they catch Nebula in time? The whole space-time structure of the universe is at stake! (mycomicshop.com)