When we reviewed the Chromecast Ultra, one of our biggest gripes was the dearth of 4K content to justify it -- not even Google's own movie store had material to watch. The company is fixing that glaring omission, though. As of now, Google Play Movies & TV carrying over 125 4K movies in the American and Canadian stores. You can buy or rent them, and choose from big-name movies like Captain Philips, Star Trek Beyond and The Secret Life of Pets. If you own a Chromecast Ultra, you'll even get a free movie (from a handful of approved selections) as a reward for your early adopter status.