Using Chromecast, you can cast movies & TV shows from the Google Play Movies & TV app from your phone, tablet or computer to your TV.
To cast from the Google Play Movies & TV app to your TV using your phone or tablet
Connect your device and Chromecast to the same wireless network.
Open the Google Play Movies Google Play Movies & TV app.
Select My Movies or My TV shows.
Choose a movie or show.
Tap the Cast Cast icon.