Gears of War Wiki
Gears of War Wiki

"Now nobody spill this shit on yourself. It's like touching the goddamn sun."
—Sid Redburn, warning Alpha Squad on the toxicity of the gas.

The Cytostatic Gas Grenade is a toxic gas grenade manufactured in limited numbers by Gabriel Diaz, Sid Redburn and Mikayla Dorn. Housing Cytostatic Gas - which in itself, is made from two chemicals: fluoracil and RZ50 - these special and unconventional grenades were made specifically to counter the accelerated healing effects of Ukkon in order to kill him. The gas itself was created at the New Hope Research Facility as a failsafe against Ukkon's healing.

These grenades were incredibly toxic, melting flesh in a near instant.[1] According to Mikayla, smelling one of the two compound chemicals that made up Cytostatic Gas was "toxic as fuck". Sid Redburn warned the team not to drop the gas as it was prone to melting skin upon contact.

The grenade itself was housed in a makeshift Stim-Gas Grenade canister, but instead of the blue stimulation gas, it contained the turquoise-green Cytostatic Gas.


Assassination of Ukkon[]

After being locked-up in jail for perceived betrayal in letting Ukkon escape, Sid Redburn told Gabriel Diaz and Mikayla about a weapon that could cripple Ukkon and render his healing abilities useless. According to Sid, his time as a security guard at New Hope gave him insight on the medical procedures that eventually led to the creation of the Locust race.[2]

In order to redeem himself from the betrayal, Sid persuaded Diaz to free him and gain the two primary chemicals that creates this gas: fluoracil and RZ50.[3] To find the chemicals, they traveled to an abandoned UIR Chemical Weapons Depot in Vasgar, and then to the Badlands Way Station for the supplies needed for the grenade[4] after which, Diaz located where Ukkon was residing and tracked him to the Zenic Province to end his creations once and for all.[5] During the final battle with Ukkon, Mikayla Dorn threw a grenade at the scientist as soon as Alpha arrived, weakening him and forcing Ukkon's retreat. After the death of his Hydra, Ukkon tried to use his immunity booster to heal himself, but was still suffering from the effects of the grenade which blocked his healing ability while Dorn threatened she had several more grenades if need be. At the end of the confrontation, Ukkon was shot in the head by Reyna Torres and killed since the grenade prevented him from regenerating the damage.

Behind the Scenes[]

  • The grenades could be the COG counterpart to the Locust Ink Grenade.
  • Due to its descriptive and visual affects of burning flesh from the bone and its toxicity, Cytostatic Gas maybe Gears of War's equivalent to White Phosphorous.




  1. Gears Tactics: Act 3 Chapter 8: Knock Knock
  2. Gears Tactics: Act 3 Chapter 2: Biohazard
  3. Gears Tactics: Act 3 Chapter 2: Biohazard
  4. Gears Tactics: Act 3 Chapter 2: Biohazard
  5. Gears Tactics: Act 3 Chapter 5: The Outsider
The Weapons and Equipment of Gears of War
Melee Weapons Chainsaw Bayonet · Combat Knife · Commando Knife · Machete · Powersaw
Rifles Designated Marksman Rifle · EMBAR Railgun · Enforcer Submachine Gun (Shock variant) · GZ18 Markza Sniper Rifle (Marksman variant) · Hunting Rifle · Musket · Longshot Sniper Rifle · Mark 1 Lancer Assault Rifle (Police variant) · Mark 2 Lancer Assault Rifle (Custom variant) · Mark 3 Lancer Assault Rifle (GL variant) · UIR Belt-fed Machine Gun
Shotguns Gnasher Shotgun · Overkill Shotgun · Sawed-Off Shotgun
Sidearms MX8 Snub Pistol · Talon Autopistol · Zapper
Grenades Beacon Grenade · Bolo Grenade · Cytostatic Gas Grenade · Flashbang · Incendiary Grenade · Molotov Cocktail · Shock Grenade · Smoke Grenade · Stim-Gas Grenade
Heavy Weapons Auto-Turret · Booshka Grenade Launcher · Buzzkill · Chain Gun · COG Machine Gun · Cryo Cannon · Dropshot Munitions Launcher · Laser-Guided Rocket Pod · Longspear Rocket Launcher · Mortar · Mulcher · One-Shot · Rocket Launcher · Salvo Rocket Launcher · Scorcher Flamethrower · Silverback Rocket Launcher · Stomper · Tripwire Crossbow · Tri-Shot Chain Gun · Twin-Barrel Turret · UIR Machine Gun · UIR Minigun · Ultra-Violet Turret · Vulcan Gatling Gun
Super-Heavy Weapons Asp SAM Turret · Ball Turrets · Brader · Defence Missile System · High Velocity Main Cannon · Flechette Guns · Fortress Artillery Cannon · Industrial Staple Gun · Kestrel Missile Launcher · Mega Mech Gatling Gun · Naval Gun · Pariah Cannon · Railgun · Torpedo · UIR Artillery Battery · UIR Anti-Air Turret
Weapons of Mass Destruction Hammer of Dawn · Imulsion Countermeasure Weapon · Lightmass Bomb · Lightmass Missile · Nuclear Missile · Venom Bomb
Equipment Adrenaline Injector · Barrier · Blow Torch · COG/UIR Ammo Crates · Cloak · COG Armor · COG Tag · Fire Extinguisher · Gas Mask · Gut-Puncher · Propane Tanks · Pulse · Remote Targeting System · Stim · UIR Armor · UIR Tag
Other Bow · Flash · Hijack · Shock Trap
Melee Weapons Butcher Cleaver · Breaker Mace · Combat Knife · Crystal Tooth Bayonet · Dual Chainsaw Staff · Explosive Flail · Serrated Knife · Staff · Tremor Hammer
Rifles Breechshot · Claw Light Machine Gun · Hammerburst Assault Rifle (Gorgon variant) · Hammerburst II
Shotguns Elite Sawed-Off Shotgun
Sidearms Boltok Pistol · Gorgon Submachine Gun
Grenades Bolo Grenade · Ink Grenade · Kryll Grenade
Heavy Weapons Boomshot Grenade Launcher · Canker · Digger Launcher · Multi-Turret · Nemacyst · Reaver Chain Gun · Torque Bow · Troika Heavy Machine Gun (RAAM's variant)
Super-Heavy Weapons Brumak Rocket Launcher · Wrist-Mounted Chain Gun · Brumak Rocket Mortar · Corpser Mine Layer · Hydra Missile Pod · Hydra Rocket Pod · Locust Defense Tower · Reaver Rocket Launcher · Siegebeast Catapult
Weapons of Mass Destruction Riftworm
Equipment Boom Shield · Imulsion Explosive Canister · Imulsion Injection Harness · Immune System Booster · Locust Ammo Crates · Locust Armor · Locust Emblem · Swarm Armor · Thumper · Torture Pod
Other Ticker
Easter Egg Weapons
Melee Weapons Elemental Cleavers · Fish Stick
Rifles A Real Gun
Shotguns Raging Buccaneer
Sidearms Despicable You · Memento Mori
Grenades Dom's Toms
Heavy Weapons Cluckshot · Trackshot
Other Relic Weapons