Gemini

Boss Double Trouble Degraded Boss
Boss

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

• 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

• 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

• 

  Contusion ingame.

• 

  Cyan Champion Contusion.

• 

  Green Champion Contusion.

• 

  Suture ingame.

• 

  Gemini as one of Delirium's forms.

Arena

When fighting Gemini, the following obstacles can spawn:

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

Possible rock combinations:

• 
• 
• 
• 

Trivia

• 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.[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.
• The names of the brothers are inspired by a song by The Mars Volta[2]

Bugs

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! 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! If Gemini's chain hits Red Poop or Spikes, the chain will disappear but Contusion and Suture will still be joined.