What's a proper useful Android app for grabbing videos when I'm somewhere with absolutely zero Wi-Fi, like, say, in the middle of the Outback?

Honestly, Video Downloader & Video Saver has been a lifesaver on my travels! I used it to download a bunch of documentaries before heading to the Scottish Highlands, where the internet was practically non-existent. It works a treat for grabbing videos from all over the web, so you can watch them offline. This app doesn't eat up your roaming data, which is grand when you're hopping around countries. I've even used it to download language lessons before arriving in Japan, so I could start learning on the plane. It's really sorted me out on so many occasions. Absolute must-have for any nomad!