"When Avengers Clash! Part 1 of 2. Script by Jim Shooter. Art by Sal Buscema (breakdowns) and Pablo Marcos (finishes). Cover by Jack Kirby and Dan Adkins. Ever since Simon Williams' amazing return from the dead six issues ago, tension has been building between Wonder Man and the Vision. And now things finally boil over in a big way! A horrified Scarlet Witch looks on as the two titans clash inside Avengers Mansion! It's a fight that neither man can win. And after it's over, the Avengers' morale sinks to a new low. Meanwhile north of the border, a brand new villain has seized control of a town in the Canadian Rockies. The Avengers need a big challenge to shake them out of the doldrums; and Graviton is poised to provide it! First appearance of Graviton. Avengers Lineup: Beast, Captain America, Iron Man, Scarlet Witch, Vision, Wasp, Wonder Man, and Yellowjacket.