What's the collective noun for a group of aliens? *?

Question

What's the collective noun for a group of aliens? *?

Answer 1

Extraterrestrials or just 'a group of aliens'. To my knowledge we haven't met any specific groups of aliens to have a name for them.

But on a fictional note a group of aliens from Mars would be called Martians.(I've only heard of a martian on television)

Answer 2

spacies