Warning: the following contains SPOILERS for Peacemaker.
Peacemaker's Cow bears no resemblance to any known DC aliens, demons, and creatures. All evidence suggests that the Cow is an entirely original creation for the show. This isn't surprising, considering how the Butterflies themselves are also original creations. Unlike Peacemaker's various DC easter eggs, neither the Butterflies nor the Cow are directly based on anything from DC Comics or the DCEU.
The massive Cow, which made its first appearance in Peacemaker season 1, episode 7 «Stop Dragon My Heart Around,» is what supplies the Butterflies with the amber honey-like liquid that sustains them. This is the only type of food that the Butterflies can eat, which means that the cow is crucial not just to their survival, but also their plans of world domination. As Peacemaker (John Cena) and the rest of the 11th Street Kids make their way to the barn where the Cow is being kept, audiences get a full view of the large alien creature.
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Peacemaker's Cow or the Butterflies may not be based on anything from the comics or the DCEU, but they do echo elements from James Gunn's horror movie roots. In fact, the way Butterflies attack and take over the minds of humans is very similar to how the leeches attack in 2006's Slither. Moreover, in Slither, one infected character eats enough food to balloon to a size and shape that's similar to the Cow. Another clue about the Cow's true origins is how it has the body and limbs of a caterpillar, while its eyes are closer to that of a spider, suggesting that it's an entirely different species. While it's unclear whether the Cow is a slave or willingly giving up its
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