Alien Ammonite
Level 1 LIGHT/Reptile Tuner Effect500 ATK / 200 DEF
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.
Alien Dog
Level 3 LIGHT/Reptile Effect1500 ATK / 1000 DEF
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 Grey
Level 2 LIGHT/Reptile Flip Effect300 ATK / 800 DEF
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 Hunter
Level 4 WATER/Reptile Effect1600 ATK / 800 DEF
If this card destroys a monster with an A-Counter by battle, it can attack once again in a row.
Alien Hypno
Level 4 WATER/Reptile Gemini Effect1600 ATK / 700 DEF
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:
â—Ź 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 Infiltrator
Level 2 EARTH/Reptile Effect800 ATK / 500 DEF
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
Level 4 LIGHT/Reptile Effect1600 ATK / 700 DEF
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
Level 3 FIRE/Reptile Effect1000 ATK / 1000 DEF
The effects of Effect Monsters with A-Counters are negated, except for "Alien Mars".
Alien Mother
Level 6 DARK/Reptile Effect2300 ATK / 1500 DEF
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
Level 6 DARK/Reptile Effect2200 ATK / 1600 DEF
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
Level 1 DARK/Reptile Effect200 ATK / 100 DEF
This card is changed to Defense Position when it is Normal Summoned or Flip Summoned. Monsters with A-Counters cannot declare an attack.
Alien Shocktrooper
Level 4 EARTH/Reptile Normal1900 ATK / 800 DEF
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.
Alien Shocktrooper M-Frame
Link 2 LIGHT/Reptile Link Effect1900 ATK
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.
Alien Skull
Level 4 WIND/Reptile Effect1600 ATK / 1800 DEF
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
Level 4 LIGHT/Reptile Effect1700 ATK / 1500 DEF
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
Level 4 FIRE/Reptile Effect1600 ATK / 1000 DEF
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
Level 4 EARTH/Reptile Effect1800 ATK / 1000 DEF
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.)
I.A.S. -Invasive Alien Species-
Level 4 LIGHT/Reptile Effect1600 ATK / 0 DEF
Cannot be destroyed by battle or card effects while your opponent has a face-up card in their Field Zone. You can only use each of the following effects of "I.A.S. -Invasive Alien Species-" once per turn. If your opponent has a face-up card in their Field Zone: You can target 1 monster they control; destroy it, and if you do, this card gains 1000 ATK. If your opponent has a face-up card in their Field Zone, while this card is in your GY: You can Special Summon this card.