Journey into Mystery #109 Oct 1969
"When Magneto Strikes!"
Magneto is testing his powers in the city;
He "attracts" Thor's attention;
They battle aboard Magneto's submarine;
Meanwhile, the Brotherhood of Evil Mutants are out looking for the X-Men;
Magneto flees from Thor in his escape vessel and the X-Men's submarine is seen pursuing him.
Guest appearances by Quicksilver, the Scarlet Witch, Mastermind, the Toad and Jane Foster.
Cameos by Captain America, Iron Man, the Thing, Mr. Fantastic and the Invisible Girl.
Script by Stan Lee,
pencils by Jack Kirby,
inks by Chic Stone.