The Avengers are rocked to their core as Captain America leaves the team. Meanwhile, Magneto returns to earth from outer space to lure the Scarlet Witch and Quicksilver back into his clutches. Plus, Hercules makes a shocking discovery.
Magneto and the Toad have been freed form their Island prison by an unwitting Dane Whitman and his experimental Magnetic Enhancing invention. Once they have escaped, they set about reuniting the core of the Brotherhood of Evil Mutants, and use the new magnetic instrument to lure Quicksilver and Scarlet Witch to the fortress, where they are quickly subdued!
Meanwhile , Captain America has decided to leaves the ranks of the Avengers so he can concentrate on being Steve Rogers, Hawkeye and Natasha quarrel, and Hercules has returned home to find Olympus completely deserted!