Thor destroyed Jormungand. olympian I'm actually a bit surprised you don't own the comic.
One of my fave Thor issues -- not a WHOLE lot of dialogue, but plenty of fighting.
Anyway, towards the end, Jormungand managed to trap Thor in his jaws. You see a panel when he is sitting there...and Thor blows out his teeth (do note that this Thor had on his armor).
They manage to separate, and Jormungand does a...do not quote me here, I do not recall the exact name he used...but a "battle stance" of some sort. I think he called it a something strike. You see Thor in the distance, charging up. He looks like a small star.
They rush (fly) toward one another (Thor is flying with Mjolnir, of course), and there is this huuuuuuuuge explosion. Jormungand's entire head is gone. Thor is shown smoking, falling to earth.
Upon closer examination, you only see the shell of his armor -- no Thor inside.
I can actually dig it up at home and scan a few of the pictures if you all like. Walt Simonson's artwork is personally my fave (of Thor, anyway).
I love The Hulk, but I'd personally give Juggernaut a better chance due to his penchant for being able to absorb huge amounts of punishment. If Jormungand hit either with that strike...well I'll keep my opinion to myself lest the Hulk/Juggernaut fans cry "foul."