At this stage TVNZ OnDemand is not available on Chromecast.
However, in the meantime, you can still enjoy all your favourite shows on the big screen with Chromecast by ‘Tab Casting’ on a computer.
Simply put, to do this all you have to do is Cast a Chrome browser tab from your computer to Chromecast, mirroring what’s on your screen onto the TV. You’ll need to have the latest version of Chrome, and to search for and install the Google Cast extension for your Chrome browser.
Once you’ve done that, you’ll see a little Cast icon available in your browser. Simply press that icon in the tab you want to Cast, choose the Chromecast device you want to Cast to, and the icon will turn blue.