Nathan Hale: Sgt. Nathan Hale is one of humanity's best weapons against the unstoppable Chimeran onslaught. While wrestling with the insidious Chimeran war machine, he must also battle the virus raging inside of his own body that threatens to transform him into the very creatures he fights against.

Advanced Hybrid: The Hybrid is the basic foot soldier of the Chimeran army. Hybrids are former humans transformed at conversion centers via the Chimeran virus. They have 'heat sinks' on their back that cool down their core temperature, which runs hot due to a heightened metabolism.