While the X-Men are having dinner, Xavier catches up on the news. He suspects that the missing Sub-Mariner could be a mutant and Magneto might try to recruit him.
At that time, Magneto was indeed on the search for the Sub-Mariner to try to join forces with him.
While the X-Men are engaged in their training sessions, Xavier decides to telepathically project himself in search of the Sub-Mariner and follows an unsuspecting Magneto.
The Sub-Mariner is hiding in his underwater palace, angered that the Fantastic Four had defeated him yet again. Magneto makes his move to enlist the Sub-Mariner into an alliance with the Brotherhood.
Xavier returns to his physical body after having discovered Magneto’s plans. The X-Men head out to sea to thwart Magneto’s plans. The X-Men arrive just as Magneto successfully lures the Sub-Mariner onto land. Seeing the X-Men attacking Magneto, the Sub-Mariner stops the X-Men.
The X-Men’s ship crashes due to overwhelming force of Magneto’s weapon. They manage to make it to “Magneto’s Isle” and find Magneto’s weapon. Cyclops proceeds to disassemble it, but Quicksilver appears to stop him. The X-Men render Quicksilver helpless, but Magneto seizes the chance to use his weapon on the x-Men, irregardless of whether he would endanger the life of Quicksilver. Scarlet Witch begs Magneto to stop, but he just pushes Scarlet Witch away. The Sub-Mariner is appalled at Magneto’s attitude towards her and destroys Magneto’s controls.
Magneto escapes when the X-Men advance toward him. The Sub-Mariner demand that the X-Men free Quicksilver per Scarlet Witch’s request. Xavier agrees to release Quicksilver after the Sub-Mariner and the rest of the X-Men have calmed down and stopped the violence. After Magneto, the Sub-Mariner has sworn all “surfacemen” his enemies, and next he intends to conquer the surface and reclaim it for Atlantis.
Magneto is still outraged at the Sub-Mariner and unleashes his weapon on the Sub-Mariner, but the Sub-Mariner is able to free himself, and he returns to the sea. Magneto also retreats.
(X-Men: The Early Years #6 is a reprint of Uncanny X-Men (Vol 1) #6.)