Neill Blomkamp‘s sci-fi Chappie has added Sigourney Weaver as filming gets underway in Johannesburg. The Sony/MRC production written by Blomkamp and Terri Tatchell follows the preternaturally gifted robot Chappie, who’s kidnapped by two criminals during birth. Weaver joins an eclectic cast that includes Hugh Jackman, Sharlto Copley voicing the eponymous Chappie, Dev Patel, Jose Pablo Cantillo, Brandon Auret, and Ninja and Yolandi Visser of the South African rap duo Die Antwoord. Sony is distributing the pic, which is being produced by Blomkamp and his Elysium producer Simon Kinberg. Sony’s Hannah Minghella and Rachel O’Connor are overseeing with Brye Adler of MRC. Weaver is repped by UTA.