There is also a selection of movies and TV shows to watch on-demand as well. The best part is that it is free to watch, meaning you don't need to subscribe. This is because it is ad-supported. Pluto TV is available in the US, where it is also free to watch. Download now to stream pluto.tv/activate 100+ channels of news, sports, and the Internet's best, completely free on Roku. Also, get access to our Free On Demand library of over 1000 entire movies and full TV episodes. There are generally a few reasons your Pluto app is crashing on your Roku: Your Roku needs to have an update run manually or to have its memory expanded. The Roku needs to be reset. Your connection is either too slow or varies too much in download speed for the app to stream consistently.