The Avengers #48 (1968)

In this issue of The Avengers, we discover that Olympus has been abandoned and our hero, Hercules, sets off on a quest for answers. Meanwhile, Dane Whitman is inspired to use his uncle's invention for good and becomes the new Black Knight. Unfortunately, Quicksilver and Scarlet Witch are being held against their will by Magneto in Garrett Castle. Despite their refusal to rejoin The Brotherhood of Evil Mutants, Magneto refuses to let them go. Luckily, Quicksilver manages to reach out to The Avengers for help. With only Jarvis at the mansion, the rest of our heroes are scattered across the country. But fear not, for Hawkeye, Pym, and Wasp come to the rescue while Hercules is still reeling from the state of Olympus. The issue also features the first appearance of Dane Whitman as the Black Knight. Will our heroes be able to save Quicksilver and Scarlet Witch and stop Magneto's evil plan? Find out in The Avengers #48.