Sci Fi meets historical epic. It works and it doesn't work. The fact that an 'alien' arrives on planet earth and is then told by his computer that it is 8th century Norway and the language is Norse is correct but Norse automatically becomes the English language which is an absolute load of bollocks. Little things like this annoy the crap out of me.
It works when it portrays ' Vikings' as everyday people who just happened to be damn good at invasion and drinking!