Captain America Returns!
More than two decades after Jack Kirby first created Captain America, Marvel literally dredges him from the depths and adds him to The Avengers roster.
Picking up right where last issue left off, Namor has vowed revenge on The Avengers, and as he travels the world, he comes upon an Eskimo tribe worshipping a figure encased in ice. In his ire, he tosses the ice block into the ocean. As it drifts southward into the Gulf Stream, it thaws, freeing it's prisoner, Captain America, who remained in suspended animation since WWII. Floating in the ocean, Cap's body is found by The Avengers, who bring him to New York. Meanwhile, Namor has discovered a marooned alien who he recruits to help in his plans of revenge!
This story is pretty chock full of action, with fights on more than half the pages, and the final battle between Namor and The Avengers taking up about a third of the issue. However, it is not without it's flaws - as usual, there's a lot of "by the way this happened" type moments, such as the petrified Avengers being moved from the docks to a warehouse and Namor finding and recruiting an alien with high tech weapons - but fortunately, most of these can reasonably be believed to have happened "offscreen".
There's also some of the standard extraordinary coincidences, Rick Jones being a dead ringer for Bucky Barnes, for example, but again they seem to be a bit less intrusive or implausible than normal.
The panels of fight sequences aren't as smoothly 'choreographed' as Kirby is normally known for, but face it, the very fact that the issue is all about bringing Captain America into the Marvel Universe forever earmarks it as a classic must-read from the period.