UNCANNY X MEN (1981) #335
Story continues from the one-shot Onslaught X-Men. The powerful psionic entity known as Onslaught has left Westchester County with both the X-Mansion and the X-Men lying in ruins! Eventually help arrives courtesy of Earths Mightiest Heroes and Nate Grey! After cooler heads prevail, the two super teams put together a plan to deal with the incredible menace of Onslaught. The Avengers will try to locate Magneto; while the X-Men seek to protect Cable and Nate Grey and also warn the Fantastic Four about the threat of Onslaught. Good luck to all!