Coon provided the voice and motion capture for Proxima Midnight in the Russo Brothers - directed action film Avengers : Infinity War ( 2018 ) .
Proxima Midnight is a member of the Black Order and a child of Thanos .
Coon provided the voice and motion capture for Proxima Midnight , a member of the Black Order and a child of Thanos , in the Russo Brothers - directed action film Avengers : Infinity War ( 2018 ) .