"The Invasion of the Lava Men!", The Avengers return to their mansion to inspect the damage caused by the battle with the Hulk; Days later, a mysterious high-pitched sound destroys a computer in one of Tony Stark's factories in Long Island and Iron Man is informed; Meanwhile, Giant-Man and the Wasp are conducting experiments inside of a large anthill; They are also affected by the noise and manage to escape before the anthill collapses; In his medical office, Don Blake reads about the effects of the noise in the newspaper; Thor meets up with Captain America and Rick Jones, who are training, and they witness another shockwave; The six heroes investigate the source of this new unknown threat; Meanwhile, in an army base in the west of the country, a strange rock breaks the surface of the earth, and soldiers investigate. Roster includes: Captain America, Thor, Iron Man, Wasp, and Giant-Man. Appearance by the Hulk. First letters page; letter to the editor from comics artist Alan Weiss.
