Hey guys, here is a crazy idea. 

if any of you read my bio, you would know that Aria is on the run from her people after she refused to kill two galaxy travelers. She crashed on earth where she hide. 

Maybe in the distant future, like a "Season finale." Aria's people could come to planet earth and try to start a war with the humans. 

I can add more if you like, but I think it might be a good idea for their first big fight.