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The Big Gate is the penultimate boss of Metal Slug 7/XX.

Information

This device is sent from the Future by Morden's own Rebel Army (much to present Morden's surprise), and it's basically a giant, hovering warp portal. Its powers are not limited to summoning Future Rebel infantry and units, but is also able to shoot fast volleys of plasma to the enemy. Before its destruction, it summons the Kraken to rescue Morden.

Despite Morden standing there and commanding during the fight, the player cannot damage him in any way.

In other games

Metal Slug Defense

The Big Gate appears in the Battle Cats collaboration event. Morden attempted to bring the Kraken to the present but somehow brought the Battle Cats who dragged him off-screen.

Metal Slug Attack

The Big Gate makes its playable debut in the "Next One" Extra Ops. It serves as both a Future Bazooka spawner and as wall from enemy attacks. The Big Gate can be unlocked by purchasing unit parts in the Battle Shop or by completing Standard 8-6 in "Attack!" mode.

Story-wise, various Rebel Soldiers use the Big Gate to transport Future Rebels and weapons to the present. This includes Nova, a future robotic clone of Vita.

Metal Slug Infinity

Named the Time Slug, it was originally used by Morden in a skirmish before it got destroyed and sent everyone in a parallel universe. Those against the Regular Army joined forces with them to escape to the original universe.

The Time Slug also provides what is called "Returning", where the player's team are transported a few stages back to avoid being overwhelmed. Returning boosts the character's stats, increases the gold regeneration rate, and rewards medals, Gems, and Piece Boxes. The drawback of Returning is that it fully resets the character's levels and the player's gold amount.

Variants

Big Gate: The original.
Golden Big Gate: A golden-plated variant of the original. It is still affiliated with the Rebel Army, but the future it comes from is unknown. Rather than deploying future Rebel Army personnel to assist in battle, it instead deploys circular saws to attack enemies, coupled with its own plasma attacks. Appears in Metal Slug Attack.
Metal Slug 7/Metal Slug XX
Heroes Marco RossiTarma RovingEri KasamotoFio GermiRalf JonesClark StillLeona Heidern*
NPCs Cynthia HartnettPOWRumi AikawaMadoka AikawaHyakutaro IchimonjiDonald MordenAllen O'NeilRebel ArmyFuture RebelsMartiansAnnouncer
Enemies FanaticsGrenade SoldierBazooka SoldierShielded SoldierBikersRebel RiflemanMortarGatling SoldierFuture RebelsHunters* • Patrol RobotMetal MoleLaser DronePodsRebel WalkerBatMaggotChariotFlying KillerMan EaterHuge IvyMars People* • Mini-UFO* • UFO*
Enemy Vehicles Di-CokkaBull ChanT-2B Melty HoneyMV-280BMV-280CNop-03 SarubiaGirida-O3-ton Utility TruckR-ShobuMH-6S MasknellEaca-BTurrets
Bosses Iron Death WormCrablopsFall ClimberThe UnionRebel GigantKraken
Mini-Bosses: Scrap TowerBig Gate
Weapons Heavy Machine GunRocket LauncherShotgunFlame ShotEnemy ChaserIron LizardSuper GrenadeDrop ShotTwo Machine GunsZantetsu SwordThunder ShotGrenadeFire BombArmor Piercer* • Mobile Satellite*
Slugs SV-001SlugnoidSlug Flyer† • Ostrich Slug* • Slug TrolleySlug ArmorSlug Gigant
Missions Scrap IslandCoal MineUnderground FortressThe WaterfallRuins BaseSnowy CountryThe Beginning is the End
Other Combat School (Dialogue) • Weapon StockRush Blaster SystemSuper Devil Mode* • "Scrap Fan"
† Exclusive to Metal Slug 7. * Exclusive to Metal Slug XX.
Bosses
Metal Slug TetsuyukiHairbuster RibertsTani OhShoe & KarnIron NokanaHi-Do
Mini-Bosses: Mini-BataAllen O'Neil
Metal Slug 2/X The Keesi II / Iron Nokana MK II (X) • Aeshi NeroDragon NosukeBig ShieeHozmiRugname
Mini-Bosses: Mosque ArtilleryThe Keesi II (X) • Karn (X) • Allen O'NeilDai-Manji
Metal Slug 3 Huge HermitMonoeye UFOJupiter KingSol Dae RokkerRootmars
Mini-Bosses: Twin Ohumein-CongaMonoeyesHairbuster RibertsHi-DoRugnameFake RootmarsClone Incubator
Metal Slug 4 Brave GuerrierToschka DalanueThe IronBig JohnSea SatanAmadeus Mother Computer
Mini-Bosses: Mecha Allen O'Neil
Metal Slug 5 Metal RearShooting RayScreamerSand MarineAvatar of Evil
Mini-Bosses: Black HoundStone Turtle (unused) • Gaia ElephantPtolemaios (unused)
Metal Slug 6 Bull DrillIron SentinelBrain RobotElder CentipedeInvader King
Mini-Bosses: Invader ControllerKing's Cocoon
Metal Slug 7/XX Iron Death WormCrablopsDestroyed CrablopsFall ClimberThe UnionRebel GigantKraken
Mini-Bosses: Scrap TowerBig Gate
Metal Slug: 1st Mission Rebel VTOLRebel TrainMacbaRebel ZeppelinElectromagnetic CraneWeapons Port BossMetal Strider
Mini-Bosses: Facility ElevatorMacbaRebel Truck
Metal Slug: 2nd Mission Big BerthaTerrain CarrierRebel ReactorMacbaRebel SubmarineTani OhWiredRebel AirplaneMetal StriderRocket UFO
Mini-Bosses: Power GeneratorsRebel RocketHyakutaro
Metal Slug Advance FormorEmain MachaKaladgolgThe Keesi IIICabracan
Mini-Bosses: Allen Jr.
Metal Slug 3D ParachuetruckMosque ArtillerySpider-BotUnderground Cruise MissileMorden's BattleshipMorden's CastleAllen O'NeilLugusLieu
Metal Slug Attack Pharaoh's ArcPtolemaiosBall SlugGreat MotherMars GigantalosK-O3 Coupled Armored VehicleLand BlowfishCyclobsterSlug SquareZoni DolomaQuadro JumperDenturionD-GuFortmeranianRock MoleGiant CopterEt A OmnisVortexDigger BaseCrusty LegsArmored CrawlerQueen Big Snail7000 Class LocomotiveRiviere HyllMetal Fusioner No.223Drum SlugMars WolfSea DragonTetsujin SquadLa TorneGigantnoidDark GateKnight TankImpact CannonDive Assault Cannon Andrew
Mobile games Rocket Control RoomUnknown AlienHellfireSpiderbotCyclopsMega Laser TurretMars Battle UFOM-32 Water Carrier PlaneKouraiAlien Floating Structure
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