Avengers (1963 1st Series) #159

"Siege by Stealth and Storm! Part 2 of 2. Script by Jim Shooter. Art by Sal Buscema (breakdowns) and Pablo Marcos (finishes). Cover by Gil Kane and Frank Giacoia.

The Avengers' assault on Graviton's airborne city has failed! And now the super-villain who can control gravity moves his floating city over the island of Manhattan! With eight avengers as prisoners, Graviton's plan to blackmail New York looks unstoppable! But dramatically two more avengers arrive on the scene! Can Thor and the Black Panther lift the Avengers to victory? 

Cover price $0.30.