The Thunder Cloud is a secret weapon in Metal Slug 3 and 4.
This is a top secret weapon (extremely rare, obtained from the "president" POW) whose ammo canister is loaded with nanobots that generates an artificial thunder cloud loaded with negative electromagnetic energy. The cloud will hover over the nearest target and zap it with lightning bolts. Once all of the nanobots' energy is used or another weapon is collected, the cloud will dissipate.
|Standard||Handgun (Murder .50AE | Murder Model-1915 .38 Mk.1Am) | AR-10 | M-3685 | M60|
|Limited||Heavy Machine Gun | Rocket Launcher | Flame Shot | Shotgun | Laser Gun | Special Shot | Grenade Gun | Iron Lizard | Super Grenade | Enemy Chaser | Drop Shot | Two Machine Guns | Zantetsu Sword | Thunder Shot | Machine Gun | Missile Pod | Sniper Rifle|
|Bombs||Grenade | Fire Bomb | Stone | Earring Bomb | Smoke Bomb | Monolith | Snowball|
|Melee||Knife | Tonfa | Hatchet | Tomahawk | Punching Glove | Stun Gun | Wrench | Vulcan Punch | Argentine Backbreaker | Moon Slasher|
|Other||AA Machine Gun | Thunder Cloud | Mobile Satellite|