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The Blighted Ovum

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The Blighted Ovum
Blighted ovum
Official artwork by Edmund McMillen
Floor(s) Cellar




Item Drop(s) Common Drops

WotL Common Drops

Rebirth Stats

The Blighted Ovum is the posthumous version of Gemini, added in the Wrath of the Lamb DLC. He appears in the Catacombs and, rarely, in the Cellar. He has a higher chance of appearing if you have killed Gemini before.

The Blighted Ovum spawns already separated, similar to the green Champion version of Gemini.


The larger sibling appears as a mangled and bloody zombie, with parts of the skull eaten away. He leaves behind a trail of Red Creep as he moves, which damages Isaac for a full heart. Unlike Gemini, he will constantly pursue Isaac, not stopping for breath after charging.

Meanwhile, the other half appears as an invulnerable spirit, and is passive unless Isaac gets in his line of sight, in which case, he fires a blood beam similar to Brimstone. He tends to stay floating in the area it spawns in, not moving around much. 

Upon death, each half shoots radial blood shots, similar to when Steven is killed.



  • In medicine, a blighted ovum is a pregnancy in which the early pregnancy appears normal on an ultrasound scan, but later no visible embryo develops. This likely refers to the smaller twin being dead (a spirit).
  • Its boss-screen artwork differs from the in-game sprite, as it has a beady, black eye and a grey body, while in-game, it is eyeless and has a blood red body.
  • The large bite on the top of the head is on the opposite side on the artwork and sprite; this is probably unintentional.
  • He is also missing his jaw like Daddy Long Legs and Headless Horseman.


The Binding of Isaac Wrath of the Lamb Bosses The Blighted Ovum00:27

The Binding of Isaac Wrath of the Lamb Bosses The Blighted Ovum

A boss fight against The Blighted Ovum.

Basement Larry Jr.MonstroThe Duke of FliesGeminiStevenFamine
Cellar WidowPinThe Duke of FliesFamineGurdy Jr.The Blighted Ovum
The Caves FistulaPeepGurdyChubC.H.A.D.Pestilence
Catacombs The HuskThe HollowThe Blighted OvumThe Carrion QueenPeepPestilenceThe WretchedGurdy Jr.
The Depths LokiMonstro IIGishWarMom
Necropolis Mask of InfamyDaddy Long LegsThe Carrion QueenThe BloatLokiWarThe WretchedMom
The Womb ScolexBlastocystThe BloatDeathConquestDaddy Long LegsTriachnidTeratomaMom's HeartIt Lives
Utero TeratomaThe BloatDeathConquestDaddy Long LegsTriachnidLokiiMom's HeartIt Lives
Sheol The FallenSatan
Cathedral Isaac
The Chest ???
First to fifth and seventh level The FallenHeadless Horseman
Devil Room Krampus

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