A new official South Park (DE) app has just been added to the Fire TV appstore. Unfortunately, the app is geographically restricted, which prevents Fire TV owners outside of Germany and Austria from installing it. You can try bypassing those restrictions, but there’s a good chance the app itself will block video playback, but I haven’t checked it myself. The first 18 seasons of South Park are available for free through the app with ads. While the text in the app is in German, the episode audio can be toggled between English and German. The app is compatible with all Fire TV models, including the Fire TV Stick.