Watch how 'Alien: Covenant's' android is born

Another Alien film, another terrifying android that could spell humanity's downfall. In Prometheus, we were introduced to Michael Fassbender's David, a robot who was a bit too curious about the nature of extraterrestrial life. Now Fassbender is back in Alien: Covenant as "Walter," a slightly tweaked android with one important difference: He has no human emotions. That should make conversation a bit tougher, but hopefully it will prevent him from using his crew as human guinea pigs.