Over in Brightburn, Kansas, life is relatively peaceful enough. Kids go to school, parents go to work and Brandon Breyer (Jackson A. Dunn), son of Tori (Elizabeth Banks) and Kyle (David Denman), is a seemingly normal Middle Schooler. Except, well, he's not normal. Now, really, nobody is "normal", but Brandon is especially abnormal. His parents have concealed his true origins, which tie into his superhuman strength as well as why he's so attracted to some strange machine located in the Breyer family barn. Realizing he's far more powerful than he ever imagined, Breyer begins to revel in his powers by committing a series of murders around his hometown, which won't remain peaceful for very long now that Brandon A.K.A. Brightburn has come around.
