Baby (also known as Spike) is the inhuman offspring of Mary X and Henry Spencer. The baby is an object of disgust for both Mary and Spencer. At the close of the film, Henry cuts away the baby's swaddling clothes, only to find that the baby doesn't have any skin. Disgusted, Henry stab's the baby's organs, causing a viscous white fuid to gush out, eveloping the baby causing it to morph into the planet shown in the beginning of the film. The planet bursts open and we find Lady in the Radiator inside. Henry joins her and the two embrace.
-No one really knows what the baby is made out of, but the most popular theory is a modified cow fetus