BBC iPlayer is the official application from the television channel BBC, thanks to which you can watch series, programs, and movies from the comfort of your Android device. That is, so long as you have an Internet connection and you're subscribed to the BBC channels.
Besides being able to stream all the content on BBC iPlayer, the application also lets you download it to the memory of your device so you can watch it whenever you want, even when you don't have Internet. Besides that, you can also conveniently send any video that you're watching to your Chromecast device.
BBC iPlayer is practically a must-have application for users that have access to the BBC channels. That said, this application won't work correctly outside of the United Kingdom, so you'll definitely have to use a VPN app or something like that.