Zero

The year is 2299 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 eight hundred 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...