creating play once only

I need a way of playing an intro video, but it must only be played the first time you start the game, and then if you ever start the game again it must not play it. How would I do that?

Thanks Kealym!

Not sure how to make a video play unless you use Unity Pro but you would need to use player prefs to save a bool for example stating that the game has already been started, so don’t play the video.