Blighted Ovum

Boss

Double Trouble

Degraded Boss

Blighted Ovum is one of the bosses that can appear in The Cellar, and is the posthumous version of Gemini.

Behavior[edit | edit source]

Blighted Ovum starts separated into two parts.

Suture is invincible and slowly floats towards the player, firing a horizontal Brimstone shot whenever the player is to its left or right. He can't die until Contusion does.
Contusion constantly chases the player and progressively gets faster, while leaving behind a trail of red creep. Unlike Gemini, he will not stop for a breath, only slow down.

Contusion as it appears in-game.
Suture as it appears in-game.
Blighted Ovum ingame.
Blighted Ovum as one of Delirium's forms.
Sketch of what appears to be an older concept of Blighted Ovum, along with other bosses that were to be added in the original The Binding of Isaac's Wrath of the Lamb DLC. Note that the behaviors mentioned in the concept art were never implemented in the original game onwards.

Blighted Ovum was added in the Wrath of the Lamb DLC for the original The Binding of Isaac.
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 boss has skin on its body in the boss art, but it doesn't in-game.
Blighted Ovum is the only boss in chapter 1 that is a posthumous version.
- Gemini also shows up in chapter 1, which makes it one of only three bosses to have its posthumous version in the same chapter, the other cases being Polycephalus and Chub having The Stain and Carrion Queen, respectively, in chapter 2.
  - However, Blighted Ovum doesn't appear in the same environment as Gemini, who appears in the The Basement while Blighted Ovum appears in The Cellar.
If encountered in a Double Trouble boss fight, its Brimstone laser can damage the other boss.
In Wrath of The Lamb, when Blighted Ovum was killed Contusion would shoot 8 extremely fast tears in the cardinal and ordinal directions, and after a short delay would be followed up by Suture who would explode similarly.

Bosses
Chapter 1	Gemini • Steven • Blighted Ovum • Dingle • The Duke of Flies • Famine • Fistula • Gurglings • The Haunt • Larry Jr. • Monstro • Pin • Widow • The Fallen • The Headless Horseman Dangle • Little Horn • Rag Man • Turdlings
Chapter 2	Chub • C.H.A.D. • Carrion Queen • Dark One • Gurdy • Gurdy Jr. • The Hollow • The Husk • Mega Fatty • Mega Maw • Peep • Pestilence • Polycephalus • The Wretched • The Fallen • The Headless Horseman The Forsaken • The Frail • The Stain Big Horn • Rag Mega
Chapter 3	The Adversary • The Bloat • The Cage • The Gate • Monstro II • Gish • Loki • Mask of Infamy • War • The Fallen • The Headless Horseman • Mom Brownie Sisters Vis
Chapter 4	Blastocyst • The Bloat • Conquest • Daddy Long Legs • Triachnid • Death • Lokii • Mama Gurdy • Mr. Fred • Scolex • Teratoma • The Fallen • The Headless Horseman • Mom's Heart • It Lives Sisters Vis • The Matriarch
Blue Womb	Hush
Chapter 5	Satan • Isaac
Chapter 6	??? • The Lamb • Mega Satan
The Void	Delirium
Greed Mode	Ultra Greed Ultra Greedier