"At the name of Jesus every knee must bow; those above the Earth, those in the earth, and those under the Earth."
There is an organization (alienresistance.org) that has studied alien abductions for years. When they began, the founders were agnostic, but became Christians when they found that in every abduction case, when the name of Jesus was mentioned the abduction ended immediately.
Free will is a spiritual principle, and is powerful. That's the reason God tells us not to sin; it's for our own protection to keep the doors to evil closed. We even have to be careful with what our eyes and ears are exposed to, as these beings are very opportunistic and look for ways to infiltrate people's lives.
It's helpful to anoint the house and property lines using a bit of oil that you have asked God to bless for anointing (dab on each door post as you SPEAK that you are anointing the house in the name of Jesus Christ, and that anything that is not holy must leave and never return).

The reason is these are the Fallen Ones, humans taken beneath the earth by the Fallen Ones ahead of the Great Flood. These humans have lost their skin pigmintation and grew larger eyes as they evolved over 10,000 years underground. We call them the Grays and they are slaves to the Fallen Ones. The tall Grays are Nephilim and also evolved in the same way. The reptilians are the Fallen Ones as is Satan. The Fallen Angels had all knowledge of the universe and could build deep underground tunnels and bases long , long ago. They also knew how to build anti gravity vehicals as well. It’s not aliens from another planet.

The greatest lie ever believed was these powers are ALL"powerful". Yes, in a sense they are. These principalities and powers of the air control entire Govt's and people in those Govt's several layers deep, BUT Jesus Christ defeated them all. These principalities and powers of the air no longer have the power they think they have. What they DO have is "willing participants" that are either blind to the fact that evil exists because of willingness, or evil because people sold their souls, bartered and lost. Either way, doesn't matter, Greater is he that is in you than he that is in the world. Christ DEFEATED them. Yeah, they can still do a lot of damage but only if you willingly allow them. Guard your minds (garage in, garbage out), don't entertain them, pray without ceasing and STAKE your claim. They've already lost.