In short: You can’t get any free movies or TV shows from Mizuu.
Mizuu is not a movie or TV show service like Netflix. Instead it’s a media management application, designed to manage and display the video content that already exists locally on your device. Mizuu will only work with your own video files.
These video files can be obtained in many different ways – you can rip DVD or Blu-Ray discs, purchase files from various web shops, use free video files or otherwise obtain files. Mizuu doesn’t really care about how you’ve obtained the files, as long as they’re locally available and honor the file naming conventions.