Mech. Chronicles

The year is 2229 and Jack Peterson has terminal cancer. He's a dead man walking until his doctor gives him a way out. If he's willing to give up his entire life, he can travel for 800 years in stasis to planet Epigog 31 to receive treatment. With no other options available, he agrees. Once there, he discovers that aliens exist and they are allies with humanity. But there's a catch to receiving treatment: While his body heals, he must act as muscle for the aliens. His conscious mind is uploaded into a mechanical battle unit and he is sent to train for warfare.

Zero and his fellow mechs have just won the first battle of a war they didn't know or care about. The Beetars are their new enemy. They are an oppressive alien race who've subjected all other races to their rule and tricked humanity into doing their bidding for a century. The mechs don't know that the first battle was to be the easiest.