Alien Dog
ATK:
1500
DEF:
1000
When you Normal Summon an "Alien" monster, you can Special Summon this card from your hand. When you do, place 2 A-Counters on face-up monster(s) your opponent controls.
Alien Hunter
ATK:
1600
DEF:
800
If this card destroys a monster with an A-Counter by battle, it can attack once again in a row.
Alien Infiltrator
ATK:
800
DEF:
500
Once per turn, this card can move to an adjacent (horizontal) unoccupied Monster Card Zone. If no Spell, Trap or Monster Card on your opponent's side of the field is in the same column as this card, it can attack your opponent directly.
Alien Kid
ATK:
1600
DEF:
700
Place 1 A-Counter on all monsters Special Summoned to your opponent's side of the field. (If a monster with an A-Counter battles an "Alien" monster, it loses 300 ATK and DEF for each A-Counter during damage calculation only.)
Alien Mars
ATK:
1000
DEF:
1000
The effects of Effect Monsters with A-Counters are negated, except for "Alien Mars".
Alien Mother
ATK:
2300
DEF:
1500
If this card destroys a monster with an A-Counter by battle and sends it to the Graveyard, Special Summon the destroyed monster to your side of the field at the end of the Battle Phase. When this card is removed from the field, all monsters that were Special Summoned by this card's effect are destroyed.
Alien Overlord
ATK:
2200
DEF:
1600
You can remove 2 A-Counters from anywhere on the field to Special Summon this card from your hand. Once per turn, you can place 1 A-Counter on each face-up monster your opponent controls. (If a monster with an A-Counter battles an "Alien" monster, it loses 300 ATK and DEF for each A-Counter during damage calculation only.) You can only control 1 "Alien Overlord".
Alien Psychic
ATK:
200
DEF:
100
This card is changed to Defense Position when it is Normal Summoned or Flip Summoned. Monsters with A-Counters cannot declare an attack.
Alien Skull
ATK:
1600
DEF:
1800
You can Tribute 1 face-up Level 3 or lower monster on your opponent's side of the field to Special Summon this card to your opponent's side of the field. If you Special Summon this monster this way, place 1 A-Counter on this card, and you cannot Normal Summon or Set the same turn. (If a monster with an A-Counter battles an "Alien" monster, it loses 300 ATK and DEF for each A-Counter during damage calculation only.)
Alien Stealthbuster
ATK:
1700
DEF:
1500
If this card is sent to the GY: You can target 1 face-up monster on the field; place 2 A-Counters on it. During your Main Phase, except the turn this card was sent to the GY: You can banish this card from your GY, then target 1 card with an A-Counter; destroy it. You can only use each effect of "Alien Stealthbuster" once per turn.
Alien Telepath
ATK:
1600
DEF:
1000
Once per turn, you can remove 1 A-Counter from an opponent's monster to destroy 1 Spell or Trap Card. (If a monster with an A-Counter battles an "Alien" monster, it loses 300 ATK and DEF for each A-Counter during damage calculation only.)
Alien Warrior
ATK:
1800
DEF:
1000
When this card is destroyed by battle and sent to the Graveyard, place 2 A-Counters on the monster that destroyed it. (If a monster with an A-Counter battles an "Alien" monster, it loses 300 ATK and DEF for each A-Counter during damage calculation only.)
Cosmic Horror Gangi'el
ATK:
2600
DEF:
2000
If you're Tributing a monster on your side of the field that is owned by your opponent, this card can be Normal Summoned with 1 Tribute. Once per turn, you can place 1 A-Counter on a monster on your opponent's side of the field. (If a monster with an A-Counter battles an "Alien" monster, it loses 300 ATK and DEF for each A-Counter during damage calculation only.)
Flying Saucer Muusik'i
ATK:
1000
DEF:
2000
While this card is face-up on the field, you can select and add 1 "Alien" card from your Deck to your hand instead of conducting your normal draw during your Draw Phase.
Interplanetary Invader "A"
ATK:
0
DEF:
500
Gain control of a monster that attacks this face-up Attack Position card, at the end of the Battle Phase.
Alien Grey
ATK:
300
DEF:
800
FLIP: Place 1 A-Counter on 1 face-up monster on your opponent's side of the field. (If a monster with an A-Counter battles an "Alien" monster, it loses 300 ATK and DEF for each A-Counter during damage calculation only.) After this card has been flipped face-up, when it is destroyed by battle and sent to the Graveyard, draw 1 card.
Alien Hypno
ATK:
1600
DEF:
700
This card is treated as a Normal Monster while face-up on the field or in the Graveyard. While this card is face-up on the field, you can Normal Summon it to have it be treated as an Effect Monster with this effect: ● During your Main Phase, you can select 1 monster your opponent controls with an A-Counter(s), and take control of it while this card is on the field. During each of your End Phases, remove 1 A-Counter from each controlled monster. If all A-Counters are removed from one of these monsters, destroy it.
Alien Shocktrooper M-Frame
ATK:
1900
LINK-2
Link Arrow:
Bottom-Left
Bottom-Right
2 Reptile monsters (Quick Effect): You can discard 1 monster; place A-Counters equal to its original Level on face-up monster(s) on the field, distributed as you wish. If this card is destroyed by battle or card effect and sent to the GY: You can Special Summon non-Link Reptile monsters with different names from your GY, up to the number of monsters your opponent controls with A-Counters. You can only use each effect of "Alien Shocktrooper M-Frame" once per turn.
Cosmic Slicer Zer'oll
ATK:
2600
LINK-3
Link Arrow:
Top
Bottom-Left
Bottom-Right
2+ Reptile monsters Monsters your opponent controls with A-Counters are changed to Defense Position, also neither player can activate their effects. You can only use each of the following effects of "Cosmic Slicer Zer'oll" once per turn. If this card is Link Summoned: You can add 1 card from your Deck to your hand that has an effect that places A-Counter(s). You can remove 2 A-Counters from anywhere on the field; immediately after this effect resolves, Normal Summon 1 Reptile monster.
Alien Shocktrooper
ATK:
1900
DEF:
800
The Aliens have used a mysterious biological substance to create a supreme race of soldiers. They do not have the natural powers of the other Aliens, but can make stunning physical attacks.
Cosmic Fortress Gol'gar
ATK:
2600
DEF:
1800
"Alien Ammonite" + 1 or more non-Tuner "Alien" monsters Once per turn, you can select any number of face-up Spell or Trap Cards. Return those cards to their owners' hands, and distribute new A-Counters among monsters on the field equal to the number of cards returned. Once per turn, you can remove 2 A-Counters from anywhere on the field to destroy 1 card your opponent controls.
Alien Ammonite
ATK:
500
DEF:
200
When this card is Normal Summoned, you can Special Summon 1 Level 4 or lower "Alien" monster from your Graveyard. Destroy it during the End Phase.
"A" Cell Breeding Device
During each of your Standby Phases, put 1 A-Counter on 1 face-up monster your opponent controls.
"A" Cell Incubator
Each time an A-Counter(s) is removed from play by a card effect, place 1 A-Counter on this card. When this card is destroyed, distribute the A-Counters on this card among face-up monsters.
"A" Cell Recombination Device
Target 1 face-up monster on the field; send 1 "Alien" monster from your Deck to the Graveyard, and if you do, place A-Counters on that monster equal to the Level of the sent monster. During your Main Phase, except the turn this card was sent to the Graveyard: You can banish this card from your Graveyard; add 1 "Alien" monster from your Deck to your hand.
"A" Cell Scatter Burst
Select 1 face-up "Alien" monster you control. Destroy it and distribute new A-Counters equal to its Level among your opponent's face-up monsters.
Code A Ancient Ruins
Each time a face-up "Alien" monster(s) is destroyed, place 1 A-Counter on this card. Once per turn, you can remove 2 A-Counters from anywhere on the field to Special Summon 1 "Alien" monster from your Graveyard.
Corruption Cell "A"
Place 1 A-Counter on 1 face-up monster on your opponent's side of the field.
Mysterious Triangle
Destroy 1 monster on the field with an A-Counter. Then, you can Special Summon 1 Level 4 "Alien" monster from your Deck. Destroy it during the End Phase.
Otherworld - The "A" Zone
If your opponent's monster battles an "Alien" monster you control, the opponent's monster loses 300 ATK and DEF during damage calculation only.
Alien Brain
When a Reptile-Type monster you control is destroyed by battle with an opponent's attacking monster and sent to the Graveyard: Take control of the opponent's monster, and if you do, it becomes Reptile-Type.
Brainwashing Beam
Select 1 monster with at least 1 A-Counter on your opponent's side of the field and take control of that monster. During each of your End Phases, remove 1 A-Counter from that controlled monster. If all A-Counters are removed from that monster, or that monster is destroyed, destroy this card.
Cell Explosion Virus
Activate only when an opponent's monster with an A-Counter declares an attack. Destroy all Attack Position monsters your opponent controls.
Crop Circles
Send any number of monsters from your side of the field to the Graveyard to activate this card. Select from your Deck 1 "Alien" monster whose Level is equal to the total Levels of the sent monsters, and Special Summon it. If you fail to find a monster to Special Summon, you take 2000 damage.
Detonator Circle "A"
Destroy 1 face-up monster with an A-Counter(s), and then inflict 1000 damage to each player.
Interdimensional Warp
Select a monster you control and a monster with an A-Counter(s) your opponent controls. Switch control of those monsters.
Mass Hypnosis
Activate only while you control an "Alien" monster. Select and take control of up to 3 of your opponent's monsters that each have an A-Counter(s) on them. This card is destroyed during the End Phase of the turn it is activated.
Orbital Bombardment
Send 1 "Alien" monster from your side of the field to the Graveyard to activate this card. Destroy 1 Spell or Trap Card on the field.
Planet Pollutant Virus
Tribute 1 "Alien" monster. Destroy all face-up monsters without A-Counters your opponent controls. Until the end of your opponent's 3rd turn after this card's activation, place 1 A-Counter on each monster they Summon.