When you start the app, you have to create an account. After that, you can access the extensive gallery of series and movies, see detailed information about each one, and start enjoying them all in original version with Portuguese subtitles. In terms of playback quality, the video isn't exactly in HD, but it's not extremely bad quality. It depends on each link.
Mega Filmes HD is a good app for watching movies and shows online, letting you enjoy hundreds of movies from different decades (there are movies from the 70s, 80s, 90s, etc.) and genres, as well as the latest releases, directly on your Android device.