Thorr (renamed "Thorg") first came to Earth in Tales to Astonish #61 and millions of years ago to await the day when he'd signal his stony comrades to come to Earth and conquer it. But a savvy Earthly lures the heavy aliens into the sea and they sink. Sigh -- those silly aliens. To read the complete story of the other mighty Thorr, go here.
More Kirby monsters lurk next time.