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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 The Basement icon.png
Boss Challenge Room Icon.pngSuper Secret Room Icon.png
Double Trouble
Stage The Caves icon.pngStage The Catacombs icon.png
Degraded Boss
Stage The Womb icon.pngStage Utero icon.pngStage Scarred Womb icon.png
Stage Sheol icon.pngStage Cathedral icon.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 The Basement. Gemini is composed of not one, but two separate "bosses": One large twin with a smaller twin attached. They have 140 health each, sharing the health bar fifty-fifty.

The large twin is called Contusion and the small twin is called Suture.[1][2]

Behavior[edit | edit source]

  • Contusion will chase the player, then periodically charge at them at high speeds. Afterward, he will stop to catch his breath, presumably because he is being choked by the umbilical cord holding them together.
  • Suture, while attached to Contusion, will shoot projectiles 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 Needs to be unlocked[edit | edit source]

  • Cyan: There is no difference to the normal version, other than dropping a Soul Heart if Contusion is killed last.
  • Green: They start separated from each other and have no difference in attacks.

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 appeared in the original The Binding of Isaac.
  • Gemini seems to be an example of a "parasitic twin", with Suture being the underdeveloped twin, dependent on Contusion.
  • Blighted Ovum is the posthumous version of them, and Steven is the alternate version.
  • The Gemini pair is named after the astrological sign of the same name; not to mention that the symbol of Gemini is a pair of twins.
  • The Gemini pair was originally designed to be a boss in Gish and was called Suture Contusion, with the larger twin being Contusion for the boot-shaped dent in his head.[2]
  • 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.
  • The names of the brothers are inspired by a song by The Mars Volta[1]

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! Removed in Afterbirth † 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 The Basement icon.pngStage The Cellar icon.pngStage Burning Basement icon.png
GeminiStevenBlighted OvumDingleThe Duke of FliesFamineFistulaGurglingsThe HauntLarry Jr.MonstroPinWidowThe FallenThe Headless Horseman
DangleLittle HornRag ManTurdlings
Chapter 2
Stage The Caves icon.pngStage The Catacombs icon.pngStage Flooded Caves icon.png
ChubC.H.A.D.Carrion QueenDark OneGurdyGurdy Jr.The HollowThe HuskMega FattyMega MawPeepPestilencePolycephalusThe WretchedThe FallenThe Headless Horseman
The ForsakenThe FrailThe Stain
Big HornRag Mega
Chapter 3
Stage The Depths icon.pngStage Necropolis icon.pngStage Dank Depths icon.png
The AdversaryThe BloatThe CageThe GateMonstro IIGishLokiMask of InfamyWarThe FallenThe Headless HorsemanMom
Sisters Vis
Chapter 4
Stage The Womb icon.pngStage Utero icon.pngStage Scarred Womb icon.png
BlastocystThe BloatConquestDaddy Long LegsTriachnidDeathLokiiMama GurdyMr. FredScolexTeratomaThe FallenThe Headless HorsemanMom's HeartIt Lives
Sisters VisThe Matriarch
Blue Womb
Chapter 5
Stage Sheol icon.pngStage Cathedral icon.png
Chapter 6
Stage Dark Room icon.pngStage The Chest icon.png
???The LambMega Satan
The Void
Stage The Void icon.png
Greed Mode
Ultra Greed
Ultra Greed
Ultra Greedier
The Binding of Isaac: Rebirth The Binding of Isaac: Rebirth The Binding of Isaac: Rebirth
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Characters Characters MainPageBabies.png Co-op Items Items Item pools Item pools Monsters Monsters Objects Objects
Pickups Pickups Pills Pills Rooms Rooms Seeds Seeds Transformations Transformations Trinkets Trinkets