Creatures of Combat (Coc's)

The story involves human volunteers to undergo a medical transformation in bulky muscled six-foot-tall black creatures to rescue an exploration crew of Earth from aliens of the Blue Mist planet. The rescuers find themselves outnumbered and outgunned by the aliens who will stop at nothing to destroy them. Lots of action and adventure are involved as this team takes on an impossible mission that no human would dare take on the mysteries of outer space.