Gerald Samson

Baby Gerald, also known as the baby with one eyebrow, is Maggie’s arch-nemesis. He made his first appearance in “Sweet Seymour Skinner's Baadasssss Song.” In that episode, Lisa referred to Baby Gerald as Maggie’s rival. Gerald is distinguished by his unibrow, being one of the few characters in the show to have one

On a few occasions, Gerald has been shown being pushed in a stroller by his mother outside the Simpsons’ house, with the two babies glaring at each other, the camera focusing on their narrowed stares. Homer often mistakes Maggie for Baby Gerald.

Gerald apparently has a history of causing large scale public incidents and was once rescued from an unspecified disaster by Bart’s mail order “wonder dog” Laddie. Both dog and baby were participants in a ceremony presided over by Mayor Quimby, during which the mayor inquired, "Baby Gerald, we can't help but wonder what mischief you'll get into next."