Thor vs. Hulk (round 1)
So, who's stronger, The Incredible Hulk or The Mighty Thor?
This issue seeks to address that question. As you may recall, the Hulk and Thor fought (very briefly) once - in Avengers #3.
This issue opens with some kids fighting over the question above, and a passing Thor stops to let them know by narrating a tale that expands upon the time Thor and Hulk were fighting "offstage" in that Avengers story.
To be sure, there is some of the usual Silver Age flaws - Stan has Hulk chucking a conveniently located landmine at Thor, etc. and Kirby draws Asgard and it's citizenry as something that looks more like a futuristic sci-fi society than medieval gods in armor.
But this is also Lee and Kirby doing what they do best - Stan's writing includes great lines like Thor thinking, "There can be no respite! No quarter asked, nor given!" And King Kirby also gives us lots of great big panels of action as two of the strongest beings in the Marvel Universe slug it out.
If you like either Thor, or the Hulk, you should seek this issue out.