Alien is a science fiction horror and action media franchise centered on the original film series which depicts warrant officer Ellen Ripley and her battles with an extraterrestrial lifeform, commonly referred to as the Alien ("Xenomorph"). The crossover series follows the encounters between the Aliens and another extraterrestrial race, the Predators ("Yautja"), and the exploits of the Weyland-Yutani Corporation pursuing these creatures. The prequel series follows the exploits of the David 8 android and the extraterrestrial race referred to as the "Engineers". The spin-off film follows a group of colonists trying to survive an onslaught of Aliens aboard a Weyland-Yutani research vessel. The television series follows a group of androids attempting to chase down Aliens released from a crashed spaceship on Earth.