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Boss Gemini name.png
Boss versus screen image
Table dividing line 1.png
In-game appearance
Table dividing line 2.png
Stage basement.png
Boss Challenge Room Icon.pngSuper Secret Room Icon.png
Double Trouble
Stage caves.pngStage catacombs.png
Stage womb.pngStage utero.pngStage scarred womb.png
Stage sheol.pngStage cathedral.png
Table dividing line 3.png
Boss Boss
Disambig.png This article is about the boss. For the item, see Gemini (Item).

Gemini is one of the bosses that can appear in The Basement. Gemini is composed of not one, but two separate "bosses": One large twin with a smaller twin attached. They both have 140 health, sharing the health bar fifty-fifty.

The large twin is called Contusion and the small twin is called Suture.

Behavior[edit | edit source]

  • Contusion will chase the player, then periodically charge at them at high speeds. Afterwards he will stop to catch his breath, presumably because he is being choked by the umbilical cord holding them together.
  • Suture, while attached to the larger, will shoot tears at the player if not behind an obstacle.
  • When Contusion is killed, Suture will detach and begin charging furiously at the player. Caution is advised when trying to juggle him, as the knock-back from tears could cause him to gain speed.

Champion Versions[edit | edit source]

Green: They start off separated from each other and have no difference in attacks.
Blue: The blue variant has more health and drops Soul Hearts

Gallery[edit | edit source]

Arena[edit | edit source]

When fighting Gemini, the following obstacles can spawn:

  • Rocks in 4 different combinations
  • Rocks will always appear when fighting Gemini.

Possible rock combinations:

Trivia[edit | edit source]

  • Gemini seems to be an example of a "parasitic twin", with Suture being the underdeveloped twin, dependent on Contusion.
  • Gemini appeared in the original Binding of Isaac.
  • Blighted Ovum is the posthumous version of them, and Steven is the alternate version.
  • Gemini are named after the astrological sign of the same name; not to mention that the symbol of Gemini are twins.
  • Gemini were originally designed to be a boss in Gish and were called Suture Contusion. The larger one being Contusion for the boot shaped dent in his head.[1]
  • Contusion is the medical name for a bruise, whereas suture is the medical name for a thread used to close gaping wounds, commonly called stitches.
  • Suture seems to be more dependent of Contusion than the latter one is from him, as Contusion will ignore his brother's death and won't change his behavior while Suture will seem to start panicking if Contusion is killed before him.

Bugs[edit | edit source]

Bug Bug! For The Cellar to unlock, the player must kill all the Basement bosses once. Gemini, however, counts as two depending on which part is killed first.
Bug Bug! If you Stun Suture at the same time that it tries to shoot Isaac, it will cause the sound effect to loop infinitely until Suture is killed.
Bug Bug! If Gemini's chain hits Red Poop or Spikes, the chain will disappear but Contusion and Suture will still be joined.

Bosses Boss Monstro.png
Chapter 1
Stage basement.png
Stage cellar.png
Stage burning basement.png
Blighted OvumDingleThe Duke of FliesFamineFistulaGeminiGurglingsThe HauntLarry Jr.MonstroPinStevenWidow
Added in Afterbirth DangleLittle HornRag ManTurdlings
Chapter 2
Stage caves.png
Stage catacombs.png
Stage flooded caves.png
Carrion QueenC.H.A.D.ChubDark OneGurdyGurdy Jr.The HollowThe HuskMega FattyMega MawPeepPestilencePolycephalusThe Wretched
Added in Afterbirth The ForsakenThe FrailThe Stain
Added in Afterbirth † Big HornRag Mega
Chapter 3
Stage depths.png
Stage necropolis.png
Stage dank depths.png
The AdversaryThe BloatThe CageThe GateGishLokiMask Of InfamyMonstro IIWarMom
Added in Afterbirth Brownie
Added in Afterbirth † Sisters Vis
Chapter 4
Stage womb.png
Stage utero.png
Stage scarred womb.png
BlastocystThe BloatConquestDaddy Long LegsDeathLokiiMama GurdyMr. FredScolexTeratomaTriachnidMom's HeartIt Lives
Added in Afterbirth † Sisters VisThe Matriarch
Added in Afterbirth Blue Womb
Added in Afterbirth Hush
Chapter 5
Stage sheol.png
Stage cathedral.png
Chapter 6
Stage dark room.png
Stage chest.png
???The LambMega Satan
Added in Afterbirth Greed Mode
Ultra Greed
Added in Afterbirth Ultra Greed
Added in Afterbirth † Ultra Greedier
Added in Afterbirth † The Void
Stage the void.png
Added in Afterbirth † Delirium
Chapters 1-4 The FallenThe Headless Horseman
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