Stream downloaded videos to Chromecast.
The new Videostream app for Android gives you a remote control to stream movies on your PC, monitor downloads, and control playback without installing a special media server.
"You can stream seemingly anything to your TV using a Chromecast, but tracking down the software you need can be time-consuming -- and it frequently won't pull media from other devices on your network. It's a good thing that Videostream has released its namesake Chrome add-on, then. The extension lets you stream almost any locally stored video through Google's media stick, regardless of type. It'll also play videos from networked PCs and drives."