Choi Ji Yoon in revealing the true identity of a terrorist group, the Asia Red Army. She was sent by CIA to infiltrate this terrorist group for Intel. However, she was busted by Ritsuka and held as a hostage. Another secret agent, May, is dispatched by CIA for a rescue mission. It is revealed then Asia Red Army, leaded by Mr. X, is funded by Douglas Jacob to use a biological weapon that can turn into monsters and zombies.
Victor's squad during the transportation of Phobos' DNA in Desert Storm operation area.
|Episode Choi||1 round, 3 maps, pursuit style. There's a defense mission in the second map. Third map faces Mr. X.|
|Episode Victor||1 round, 3 maps, pursuit style. All maps face Condemned Criminal.|
|Episode Lucia||1 round, 3 maps, pursuit style. Third map faces Tyrant Crab.|
|Episode Carlito||1 round, 3 maps, pursuit style. Second map faces Comanche 3 times. Third map faces Agent Jay.|
|Forest Keeper||2 rounds, raid style. First round faces two from all season 1 ~ 5 bosses random (except Bio Scorpion, Kraken, Gluttony and Crono Wing). Second round faces Angra and Bootleg.|
Terrorist group. Her mission was later revealed by another agent when she was trying to look through the confidential documents about ARA and had to flee back to her country. She joined the Counter-Terrorists in hope that one day she could get her hands on the documents again.
ARA during her mercenary time. There she discovered a spy looking through the secret papers of the ARA, and now she tries everything to keep the secret information from getting out.
The Army Commander-in-Chief for Zombie Support Unit. He is a high war hero trust and loyalty of people for the country. It is the most dangerous also thanks to the envy and admiration of the soldiers to the commanding jumped directly here.
She is a team leader of Garcia fleet’s Counter-Terrorist. She became the team leader as she has achieved a big accomplishment in the battle with terror happened in the Indian Ocean. She might be sensed something when a terror has occurred which is using supplies to explode that is sent to her, so she leads her team to pursuit the criminal.
Carlito was a mercenary from Vanguard Company. He was paid to steal an important information from a laboratory by a Douglas Jacob. As soon as he returned to the base, Vanguard Company is in the brink of destruction.
- Mr. X (Mecha & zombie forms) - The boss that appears in Episode Choi, who helps Ritsuka to capture Choi Ji Yoon.
- Condemned Criminal (Armored & unarmored forms) - The boss that appears in Episode Victor, the most wanted of Counter-Terrorist squad.
- Tyrant Crab - The boss that appears in Episode Lucia.
- Agent Jay - The boss that appears in Episode Carlito.
- Deimos - Has high health and attack power. 4000 HP for host while 8000 HP for Origin. Host can use [Shock] ability to drop human's weapon, appears in Episode Victor, Episode Lucia and Episode Carlito.
- Ganymede - Siege Type Deimos. Very high health power and very deadly attack damage. Each has 16000 HP. Can do [Shock] and [Dash] abilities, appears in Episode Victor only.
- Comanche - Helicopter. It is equipped with 20mm Gatling guns and 70mm missile launchers, appears in Episode Carlito only.
- Regular Zombie - Normal zombies with medium attack damage and speed. The origin has higher health.
- Light Zombie - Has faster movement speed, attack rate and harder to be killed than regular zombies, but with lower health.
- Heavy Zombie - More durable and does higher damage than regular zombies, but moves slower. Can release a trap to lock human's movement for a while.
- Voodoo Zombie - Support zombie that heals their allies. They also have higher health points than regular zombies.
- Psycho Zombie - A zombie with high health points and high attack damage. It can release a black smoke to disturb human's concentration.
- Hound Zombie - Dogs that were infected by the Z-VIRUS. They are quite small but very agile, thus making it harder to be killed.
- Sting Finger - Similar to Light Zombies, but can attack in longer range than most zombies.
- Venom Guard - Explodes upon death. The death blow can injure and knock humans away.
- Parkour Zombie - A new type of zombie. Their speed and capability to climb up walls makes them hard to get rid of.
- GSG-9 - The enemies of Ritsuka and Mr. X, appeared in first map of Episode Choi.
- Asia Red Army - The enemies of Choi Ji Yoon and May, the henchmen of Mr. X, appeared in second and third maps of Episode Choi.
- SAF - Appeared as dead soldiers after attacked by XT-300 Goliath in Episode Victor.
- Walter - Appeared as a team leader in Episode Victor. He later died when attacked by XT-300 Goliath.
- SEAL - Some operatives are found dead in the ship in Episode Lucia.
- Instead of just zombies, this season features human enemies, most probably imported from Human Scenario.
- This season focuses on a specific character in the chapter.