By now, Amazon Prime Video subscribers should be used to seeing some of the best movies ever made among the streamer's library of films. August was a particularly great month for movie lovers, with Oscar-winning films arriving alongside fan-favorites. To help you narrow down your viewing options, Watch With Us has selected the five best Prime Video movies to watch in August, as ranked by Rotten Tomatoes. Surprisingly, this list has two very different boxing movies at No. 1 and No. 2 and the Amazon debut of a film from one of 20th Century Studios' famous sci-fi franchises.