The Alien Quadrilogy is a 2003 nine-disc DVD box set containing the films Alien, Aliens, Alien3 and Alien Resurrection. While there had been numerous previous home video releases in the Alien franchise, the Quadrilogy is notable in that it was the first attempt by 20th Century Fox at presenting a definitive collection of the films in the series, with a wealth of special bonus material created specially for the release.
Each of the four films is presented in two different versions — the original theatrical release and an alternate, typically extended cut. Three of these alternative cuts (the Alien Director's Cut, the Alien3Special Edition and the Alien Resurrection Special Edition) were created especially for the Quadrilogy set, while the fourth, the Aliens Special Edition, had originally been created for home video in 1991. In addition to its inclusion in the Quadrilogy, the Alien Director's Cutreceived a limited theatrical release several months prior to the release of the box set, to coincide with the 25th anniversary of the original release of Alien.