I'm working on a species of aliens for my story and they are very essential to the plot. They have to be only frightening and intimidating. My fear is that if I don't describe them properly then people will laugh where they should have some kind of fear response. If they aren't seen as a threat, then my protagonist doesn't get any brownie points for standing up to them. Any tips on how to describe something in a way that is scary and how I can make sure they won't be seen as like Jar-Jar Binks or something terrible like that? Help!