Time-Travel
A process requiring 1.21 jigawatts in which a Delorean can travel through the fabric of space and time to arrive in the past or future. Only Emmett Brown and Skynet understand this sorcery.
Xenomorph
The main alien species and antagonists in the Alien film franchise, designed by H.R. Giger. They've got mouths in their mouths and acid for blood and their heads are really long.