A striking discovery, Dayo Okeniyi will be unfamiliar to most in the lead role. He played a small part as District 11 tribute Thresh in “The Hunger Games,” and appears opposite Jennifer Lopez in “Shades of Blue,” but Emperor is effectively his breakout, which makes him feel as much a revelation to audiences as Green’s story will be.
Emperor is lousy in the same way that many other mediocre slave narratives are: it re-presents a dark period in American history without being inspired or insightful enough to be worth your curiosity or emotional investment.