Far out dudes that love some good kush. Can be often seen flyin around in their saucerz stoned af looking for some dank weed that humans crop. Their language consists of 'Ayy' and "lmao' said in varying lengths and tones.
An excellent science fiction movie series. Features a race of insect-like aliens called Xenomorphs, which have acidic blood and a collective mentality. They lay eggs like normal insects, but the larvae can only mature into adults by leaping onto a host organism's face and injecting themselves dow into the digestive tract. The adults burrow themselves out of the host, killing it in the process.
Basically, if you have an alien Xenomorph on your planet, your species is doomed.
Little people, similar looking to Oompa Loompas, except with 5 extra arms and are capable of shape shifting. In ancient times they came to populate earth, and to achieve this, they killed all dinosaurs, However later on they were scared off by Jesus. In recent years, they have returned, abandoning one of their own here in disguise as Justin Bieber.
Visitors from another a different planet. That take deep interest in the human race. They are known to come in all shapes and sizes and abduct people usually at night. However not all extraterrestrials have intentions of harming people, in fact some want to help strengthen are race before we become a tragedy.