The first book features a man from a planet populated entirely by intergalactic heroes whose role it is to pass out justice and so forth (think along the lines of the film, The Last Starfighter) Someone who isn’t entirely keen on receiving this justice attacks the planet and leaves it glowing green with radiation. One of our heroes returns to the planet after the attack and is aflicted with the radiation. Somewhere along the line he receives treatment, the result is his skeleton is replaced/upgraded and becomes essentially unbreakable. With unbreakable skeleton in tow, he sets about righting some more wrongs.
Using his unbreakable skeleton, he is able to withstand the torture of being shot with a Jangler, like a taser, while being tied down. The idea being that when, erm, Jangled, the body will writh so much that it will break itself. He also fights one bad guy whose armour he breaks open to expose a horribly underdeveloped body that he crushes.
The second book is set in Earth’s future. Aliens have taken over to strip mine the planet. One of the few survivors fighting the aliens comes across various artifacts of Earth’s past, for example a USAAF missile that he detonates to take out some aliens. In order to make this vague description a bit more useful, I remember the aliens used some sort of half mechanical, half alive bat shaped scout. Another chapter starts with the aliens slowly scouring the Earth’s surface, as they go along every little bit of vegetation that could hide a human is eliminated. The book ends with the aliens deciding Earth is now empty of resources and can be safely abandoned.
Both books IIRC are from a short series (and apologies, I didn’t realise the second description was so lacking until I wrote it down…)
