Unobtainable Units

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Unobtainable Units

Units which cannot be directly added to one's collection. Some were implemented in the original version of the game, Metal Slug Defense, but remain dummied out in the successor, Metal Slug Attack. Some are implemented, but can only be used by CPU players during certain stages. Some are alternate versions of units, with different stats and / or attack patterns. Some are only available through a unit summoning.

Previously Unlockable

Units which could be unlocked in Metal Slug Defense, but are unobtainable in Metal Slug Attack. Although some of them can be summoned by existing units (such as Abul Abbas).

3-Ton Utility Truck	Spawns an unlimited supply of Arabian Fighters. Although they cannot be unlocked directly, Abul Abbas can summon these.
Amadeus Type-α  Amadeus Type- β	MSA aggregated these two units into Amadeus Type:α.
Armor Unit	Although they cannot be unlocked directly, the Masked Soldier can summon these.
Crab Nest	Spawns an unlimited supply of Chowmein-Conga. The Dress Up shop offers it as a custom base avatar only.
Crablops (Legs)	The boss Crablops, deprived of its upper half. Fires at enemies from a large turret. Re-introduced as Crablops Type-Lower.
Di-Cokka Ver.F	A futuristic version of the Di-Cokka.
F.Bazooka Soldier	Although they cannot be unlocked directly, the Big Gate can summon these.
F.Rocket Soldier	Leaps to the ground and fires rockets from his backpack.
Forklift	Trevor riding upon a forklift. It's able to lift the cab for high-up attacks.
Landseek	A truck with an anti-aircraft gun mounted in the back.
Morden Bus	Summons an unlimited supply of Rebel soldiers. MSA' has a similar version which calls forth enraged troops.
Mummy Generator	Summons an unlimited supply of Mummies. There is also an alternative version that summons Mummy Cats only.
MV-280C Ver.F	A futuristic version of the MV-280C. Still hard to drive due to its large hood ornament. Ironically, the original version was never implemented in both games.
Ohumein-Conga(Brown)	A giant enemy crab! Its siblings, the red and green variants, are already available in MSA.
Party People	A regular Mars Person in fancy dress. The original variant, but the last remaining version missing from MSA.
Protogunner	The Protogunner was once ridden by Ralf, who'd leap out and continue on foot if it were destroyed. Tarma takes his place in MSA, although there is an upgraded version ridden by Ralf himself, however he doesn't leap out of it upon getting destroyed.
Regular Army Truck	Summons an unlimited supply of Regular Army commandos. The Dress Up shop offers it as a custom base avatar only. It is later re-introduced as the Golden Regular Army Truck.
Scrap Tower	A miner-placed tower. MSA has a similar version which instead contains yellow Rebel Soldiers.
Snowman Marco	Contains Marco.
Snowman Tarma	Contains Tarma.
Snowman Trevor	Contains Trevor.
Snowwoman Eri	Contains Eri.
Snowwoman Fio	Contains Fio.
Spike Bunker	A miner-placed unit that fires in a straight line.
Super Devil Fio	Fires cannon shells from her hand gun. Her illustration still exists in-game but unused.
SV-001 Type-R	MSA offers an alternate version, ridden by Marco. The MSA version never uses its cannon as a special attack.
The Snail House	Summons an unlimited supply of Big Snails. The Dress Up shop offers it as a custom base avatar only. The shell is later then reused by the Queen Big Snail.
UFO	A UFO that fires laser on set intervals.
W.Bazooka Soldier	Has a bazooka and alpine camouflage.
W.Paratrooper	Drops from the sky with a bazooka.
Zombie (Young Man)	One of the later units added to MSD. It is later re-introduced as Parasite Zombie, an Invader affiliated zombie, with a parasitic larva infecting him.

CPU Only

Units which have only ever been available for use by the AI-controlled player.

Amadeus Boss	A stationary version of Doctor Type: AI.
Cannon Diver	Sits below the regular playing area, firing shots upwards towards the units overhead.
Clark	An alternate version of Clark.
Dangling Maggot	Hangs from the ceiling, occasionally dropping Maggots downwards.
	Alternate versions of Emain Macha, used during boss battles.
Dragon Nosuke	The original precursor to the cut-down Dragon Nosuke+.
Fake Rootmars	A stationary boss. Can be summoned using the Mars People Officer.
Giant Sasquatch	Appeared as a target during the Merry Christmas! Extra Ops.
Hanging Mutated Soldier	Drops from the ceiling to explode on your units.
Hozmi	The original, floating version of the boss, attacking from below your units.
Kaladgolg	Fights in much the same manner as Tani Oh, firing from below your units.
Mobile Satellite	Auto-targets units and fires bolts of lightning at them.
POW1  POW2  POW3	Targets for Combat School.
Riderless Ostrich	Used in the Food Army! Extra Ops as a target. Later returned for Food Army! 2nd.
Sandmarine Boss	An alternate version of the Sandmarine.
Tani Oh	Unlike the playable Tani Oh, this version attacks from beneath your units and can stun them.
Tetsuyuki	The original and the very first boss.

KoF Units

Units making cameo appearances from SNK's King of Fighters series of video games. Some of the KoF Units released on Metal Slug Attack are part of the Regular Army.

	Andy Bogard.
	Athena Asamiya.
	Benimaru Nikaido.
	Brian Battler.
	Chang Koehan.
	Chin Gentsai.
	Choi Bounge.
	Goro Daimon.
	Heavy D!.
	Iori Yagami.
	Joe Higashi.
	Kim Kaphwan.
	King.
	Kyo Kusanagi.
	Lucky Glauber.
	Mature.
	Robert Garcia.
	Rugal Bernstein.
	Ryo Sakazaki.
	Sie Kensou.
	Takuma Sakazaki.
	Vice.
	Yuri Sakazaki.

Battle Cats Units

Units introduced to MSD during a collaboration event with Battle Cats. Metal Slug units were also introduced to that game at the time.

	Cat.
	Wall Cat.
	Gross Cat.
	Titan Cat.
	Teacher Bun Bun.
	Cat Infantery. A W.Soldier with a Cat riding atop his snowball.
	Cat Mini UFO. A cat... in a Mini U.F.O..
	Cat Slug. Rides on a SV-001.
	Cat Storage. Summons an unlimited supply of random cat-types.
	Iron Nokameow.

Daily Ranked Units

Weak units used in Daily Ranked events sometimes appear in alternate colours, and yield slightly more points when killed. These recolours may sometimes appear when summoned by other units, too (such as White Baby (Prototype)).

	Amadeus Robot.
	Chowmein-Conga.
	Girida-O.
	Mini Hermit.
	Gunner Unit.
	Hazmat Soldier.
	Invader.
	Mummy.
	Native.
	Pirate Soldier.
	Rebel Infantry.
	Soldier.
	Special Force.
	SV-001‎‎.
	Tar Man.

Summoned Units

These are units which are usually available thru an another unit capable of summoning, however mostly they do not contain an "Icon" like most unobtainable units do.

Summoning Unit	Units Summoned	Notes
	Beatriz Ice Statues	Walls are summoned upon killing a unit or evading. The Playboy bunny Beatriz has triple the health of the regular Beatriz ice statues.
	Blaze Bull Chan	4 increases the summoned unis count.
	Cabrakan Pod	This one differs from the obtainable one. (The one summoned by Cabrakan MK II as well)
	Hover Unit(Navy)	Commander (Navy) can buff these units' stats.
	80tM107	4 simply increases the attack count of the summoned units.
	Amadeus Bazooka Soldier	This one differs from the playable version. The ones summoned by the Doctor(Brave Guerrier) are weaker and fires different projectiles in comparison.
	Golden Amadeus Bazooka Soldier	These units behave exactly the same as the parachute versions.
	Force Shield	4 increases the summoned units count.
	Snowball	4 increases the summoned units count.
	Gray Hunter Walker	Upon its death as a wall, it summons grey hunter walkers with poison capabilities.
	Young Hopper Mecha	The Golden Mars Mecha can buff these units' stats.
	High Caliber Hard Cannonball	4 increases the summoned units count.
	Mass Enlargement Elastic Shell	4 increases the summoned units count.
	Golden Regular Bazooka Soldier, Golden Regular Shielded Soldier	2 and 3 buffs the respective units' stats, while 4 increases the summoned units count.
	Marigold (Pumpkin Ice Wall)	4 increases the summoned units count. Any of her kills are converted into pumpkin walls as well.
	Man Eater Arche(Ver. gold)	4 increases the summoned units count for the special attack.
	Sand Spirit	4 increases the summoned units count.
	Sand Spirit	4 increases the summoned units count.
	Fridge	4 increases the summoned units count.
	Assault Team (Girida-O+ P.M., Black Hound Type-R, and Bradley Ver.Rebellion)	All of the summoned units' stats uses their predecessor's stats along with the Land Blowfish's skills.
	Mummy	The mummy is invulnerable.
	Mechanical Tentacle	The Mechanical Tentacle is immune to stun attacks.
	Jet Cutter Head	4 allows Maya to provide a barrier.
	Upright Hermit	3 simply increases the attack count of the summoned units.
	Sand Illusion	Summoned upon killing a unit with a long-ranged attack or via 3.
	Laser Sight Unit	4 increases the summoned units count.
	Machyna	3 allows Machyna to perform a suicide attack. Machyna is also invulnerable.
	Machyna	Machyna is invulnerable.
	Special Forces Shield	These Shielded Soldiers are only summoned via close range attack.
	Jupiter King Head	3 increases the summoned units count.
	The Gutsy Drill	4 increases the summoned units count.
	Armor Unit(Abyss)	Special Mira can also buff these units' stats.
	Cracking Shield	4 increases the summoned units count.
	Aerial Defense Unit	Only summoned via 3.
	Nowan Fission	Special Nowan can also buff these units' stats.
	Metal Hopper	4 increases the summoned units count.
	Machyna	3 allows Machyna to perform a suicide attack. Machyna is also invulnerable.
	Demon Buster Mortar	Demon Buster Mortar is invulnerable
	Auto Mortar	Auto Mortar is invulnerable
	Snowball	4 increases the summoned units' Health Points.