"Alien" (1979) is widely regarded as a masterpiece due to its innovative blend of science fiction and horror. Directed by Ridley Scott, it features a strong narrative, atmospheric tension, and groundbreaking special effects for its time. The film's strong character development, particularly of Ellen Ripley, portrayed by Sigourney Weaver, broke gender stereotypes in the genre. Its use of claustrophobic settings aboard the Nostromo and the terrifying design of the Xenomorph by H.R. Giger created a lasting sense of dread, making it a landmark in both horror and sci-fi cinema.

To watch all the "Alien" movies in order, follow this sequence: 1. **Alien** (1979) - Directed by Ridley Scott. 2. **Aliens** (1986) - Directed by James Cameron. 3. **Alien 3** (1992) - Directed by David Fincher. 4. **Alien: Resurrection** (1997) - Directed by Jean-Pierre Jeunet. 5. **Prometheus** (2012) - Directed by Ridley Scott (a prequel). 6. **Alien: Covenant** (2017) - Directed by Ridley Scott (a sequel to "Prometheus"). This order allows for a chronological viewing of the main storyline and its prequels.

"Alien: Romulus" is an upcoming installment in the "Alien" franchise, directed by Fede Álvarez. Set in the same universe as the original series, it focuses on a group of characters navigating the dangers of an alien-infested environment. The film aims to explore new themes while retaining the suspense and horror elements that fans expect. While specific plot details remain under wraps, it promises to expand the lore of the franchise and introduce fresh perspectives on the iconic creature.

The best "Alien" film is widely considered to be "Alien" (1979), directed by Ridley Scott. It is praised for its groundbreaking blend of science fiction and horror, introducing audiences to the terrifying xenomorph and featuring Sigourney Weaver's iconic performance as Ellen Ripley. The film's tension, atmospheric design, and themes of isolation and survival have had a lasting impact on the genre. While "Aliens" (1986) directed by James Cameron is also highly regarded for its action and character development, the original film remains a classic that set the standard for the franchise.