Central to the film’s narrative engine is an overarching institutional relationship that sets the plot in motion: the intersection of the legendary street executioner, (played by Karl Urban), and the unnamed Chief Judge —frequently referred to by fans and production circles as Stella (played by BAFTA-winning actress Rakie Ayola).
This response uses data provided by Google's Knowledge Graph Rakie Ayola as Chief Judge - Dredd (2012) - IMDb Rakie Ayola credited as playing... Chief Judge. Rakie Ayola: Movies, TV, and Bio - Prime Video dredd and stella
“Cadet,” he said.