Avengers Vol.1 #85
After concluding their amazing adventure on Polemachus, the Prince of Asgard uses his mighty mjolnir to sweep the Avengers back to Earth! Once the Vision, Goliath, Quicksilver, and the Scarlet Witch arrive at their Fifth Avenue headquarters; they look forward to rest and relaxation! But upon entering their familiar home, the tired quartet bumps into Nighthawk! Has the Squadron Sinister invaded the mansion?! No, the Avengers have apparently invaded someone else's mansion! What? In a bizarre twist of fate, the extra-dimensional jump from Polemachus went awry! Earth's Mightiest Heroes have landed on a parallel Earth with a different superhero team: the Squadron Supreme! When the two teams meet, cooler heads don't prevail! And the Mighty Avengers test their mettle vs. the Squadron Supreme!
Printed: Feb 1971
Writers: Roy Thomas
Art: John Buscema and Frank Giacoia
Cover: John Buscema and Bill Everett