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Gemini monsters (Japanese: デュアルモンスター Dyuarumonsutā "Dual Monster") are Effect Monsters with the ability "Gemini". Gemini monsters are treated as Normal Monsters with no usable effects when first placed on the field, but can gain usable effects if they are Normal Summoned while already face-up on the field.
Gemini monsters debuted in Tactical Evolution. The "Chemicritter" archetype is heavily focused on, and almost completely composed of, Gemini monsters. The "Red-Eyes" archetype also contains several Gemini monsters.
All Gemini monsters share the following two effects:
Gemini monsters treated as Normal Monsters can be Normal Summoned while already face-up on the field (this Normal Summon is referred to as a Gemini Summon in some video games). Normal Summoning a face-up Gemini monster is still a Summon, so it can be negated by cards and effects that negate Normal Summons. Unlike when being Normal Summoned from the hand, Tributes are not required to Normal Summon a Level 5 or higher Gemini monster that is already on the field.
Cards and effects that are targeting or affecting the Gemini monster (such as Equip Spell Cards) remain in effect after the Summon. If a Gemini monster that has gained its effects is flipped face-down, it will become treated as a Normal Monster again when it is flipped back up.
Some card effects (such as "Supervise" and "Superalloy Beast Raptinus") allow Gemini monsters to gain their effects without being Normal Summoned. If these effects stop applying, Gemini monsters that only gained their effects due to one of these card effects (i.e. had not been Normal Summoned while face-up on the field) lose their effects again.
Gemini monsters require the player using their once-per-turn Normal Summon to grant an already summoned monster its effects. Since all non-Gemini effect monsters do not require such a cost to "unlock" their effects, the effects that Gemini monsters provide must outweigh their opportunity cost for the trade to be valuable. Unfortunately, due to their often old designs, most Gemini monsters do not have powerful enough effects to make up for their Normal Summon cost.
Because of their hefty costs and weak effects, most Gemini playstyles heavily depend on Gemini support cards to offset their costs and enable certain power cards that specifically require Gemini monsters. Key Gemini support cards include:
Gemini monsters also benefit from some Normal Monster support, due to being treated as Normal Monsters while first summoned onto the field and in the GY. However, key Normal Monster consistency cards like "Unexpected Dai" do not work on Gemini monsters, because they are not treated as Normal Monsters in the hand or Deck.
Because many Gemini monsters belong to other archetypes, Gemini decks often benefit from other archetypal support as well.
This is a historical Gemini-focused deck revolving around "Elemental HERO Neos Alius", who benefits from "HERO" support (e.g.: "E - Emergency Call") and Gemini support, specifically "Gemini Spark".
Effect Gemini Monster ("Red-Eyes Black Flare Dragon")
Gemini monsters have made brief appearances in Yu-Gi-Oh! 5D's, Yu-Gi-Oh! ZEXAL, Yu-Gi-Oh! ARC-V, and Yu-Gi-Oh! VRAINS.
| Language | Name | Romanized | Translated |
|---|---|---|---|
| French | monstre Gémeau | — | |
| German | Zwillingsmonster | — | |
| Italian | mostro Gemello | — | |
| Portuguese | monstro Gêmeos | — | |
| Spanish | monstruo Géminis | — | |
| Japanese | デュアルモンスター | Dyuaru monsutā | Dual monster |
| Korean | 듀얼 몬스터 | Dyueol monseuteo | Dual monster |
| Chinese (Traditional) | 二重怪獸 | Èrchóng guàishòu | Dual monster |
| Chinese (Simplified) | 二重怪兽 | Èrchóng guàishòu | Dual monster |