The 20 Greatest Sci-Fi TV Series of All Time, Ranked by IMDb Score

Science fiction on television allows us to explore our biggest questions about the future and what it means to be human. These shows transport us to other worlds and introduce us to new technologies, showing us what we could become, for better or for worse. The best sci-fi series leave a lasting impression long after we have finished watching.

This list celebrates the most impactful science fiction shows ever created, considering their stories, influence, and enduring legacy. From early classics that broke new ground to modern epics with complex worlds, these are the series that have defined the genre. They have thrilled audiences and prompted us to think about our place in the universe.

Lost (2004) [IMDb: 8.3]

The survivors of a plane crash find themselves stranded on a mysterious island. They must work together to survive while uncovering the island’s many secrets. The show blends science fiction with elements of drama and supernatural mystery.

Lost was a massive cultural phenomenon during its run. Its compelling mysteries and character-driven stories kept viewers hooked week after week. The show’s finale was highly anticipated and remains a topic of debate among fans.

Star Trek: The Original Series (1966) [IMDb: 8.3]

This series followed the crew of the starship Enterprise on their five-year mission to explore strange new worlds. Led by Captain Kirk, the crew encountered new civilizations and faced various dangers. The show was known for its optimistic view of the future, where humanity had overcome its divisions.

Star Trek was groundbreaking for its diverse cast and its stories that often addressed social issues. It gained a massive and dedicated fanbase that has kept the franchise alive for decades. The show’s influence on science fiction and pop culture is immense, inspiring real-world scientists and engineers.

Babylon 5 (1994) [IMDb: 8.4]

Babylon 5 is a space opera that takes place on a five-mile-long space station in a neutral territory. The show follows the human military staff and alien diplomats who are stationed there. The station was created to maintain peace among different spacefaring species after several major wars. It serves as a place for diplomacy and trade. The series premiered in 1994 and ran for five seasons.

The main story arc occurs between the years 2257 and 2262. It deals with political intrigue within and between different races, the aftermath of wars, and a major conflict between ancient races that happens every thousand years. The human characters play a key role in resisting a totalitarian government on Earth. The show is known for its planned story arcs and was often described as a “novel for television.”

The Handmaid’s Tale (2017) [IMDb: 8.4]

In a dystopian future, a totalitarian society has overthrown the United States government. Fertile women, known as “Handmaids,” are forced into child-bearing servitude. The story follows one Handmaid’s struggle to survive and fight back.

The Handmaid’s Tale is a powerful and often difficult-to-watch series. It has been praised for its stunning cinematography and incredible performances. The show has become a cultural touchstone, with its imagery often used in political protests.

Doctor Who (1963) [IMDb: 8.4]

This long-running British series follows the adventures of a Time Lord called the Doctor. The Doctor travels through time and space in a ship called the TARDIS, which looks like a police box. The show is famous for the Doctor’s ability to regenerate, allowing different actors to play the role.

Doctor Who has become a global phenomenon, beloved by generations of fans. Its mix of adventure, humor, and sometimes scary stories has kept it fresh for over 60 years. The show’s enduring appeal lies in its imaginative storytelling and its ever-changing lead character.

Stargate SG-1 (1997) [IMDb: 8.4]

A secret military team explores the galaxy using an ancient alien device called a Stargate. They encounter new civilizations, make allies, and battle powerful enemies. The show is based on the 1994 movie Stargate.

Stargate SG-1 ran for ten seasons, making it one of the longest-running sci-fi shows. It was beloved for its sense of adventure, humor, and its likable characters. The show spawned a successful franchise with several spin-off series.

Fringe (2008) [IMDb: 8.4]

An FBI team investigates a series of unexplained events known as “The Pattern.” They are assisted by an institutionalized scientist and his estranged son. The team uncovers a parallel universe and a threat to both worlds.

Fringe was a sci-fi series that combined monster-of-the-week episodes with a larger, serialized story. It was praised for its imaginative science and its strong character development. The show has a dedicated fanbase that appreciates its creativity and heart.

The Expanse (2015) [IMDb: 8.5]

In a future where humanity has colonized the solar system, tensions are high between Earth, Mars, and the asteroid belt. A detective, a ship’s officer, and a politician uncover a conspiracy that threatens to ignite a war. The show is known for its realistic depiction of space travel and physics.

The Expanse has been praised for its complex political narrative and stunning visual effects. It is based on a popular series of novels and has a dedicated fanbase. The show is considered one of the most intelligent and well-crafted sci-fi series in recent years.

Westworld (2016) [IMDb: 8.5]

This series is set in a technologically advanced theme park where wealthy guests can live out their fantasies. The park is populated by lifelike androids, called “hosts,” who begin to develop consciousness. The show explores themes of artificial intelligence, free will, and the nature of reality.

Westworld was praised for its intricate plot, stunning visuals, and philosophical themes. The show’s complex narrative challenged viewers to question what they were seeing. Its first season, in particular, was a critical and popular success.

Star Trek: The Next Generation (1987) [IMDb: 8.6]

Set a century after the original series, this show follows a new crew aboard a new Enterprise. Led by the diplomatic Captain Jean-Luc Picard, they explore the galaxy and encounter new life forms. The series continued the optimistic vision of the original Star Trek.

The Next Generation became even more popular than the original series. It was praised for its strong writing, complex characters, and its focus on diplomacy and ethical dilemmas. The show is a beloved classic and a high point for the Star Trek franchise.

The Leftovers (2014) [IMDb: 8.6]

This series takes place three years after two percent of the world’s population suddenly vanishes. It follows the lives of those left behind as they struggle to cope with the unexplainable loss. The show explores themes of grief, faith, and the search for meaning.

The Leftovers was praised for its emotional depth and powerful performances. It was not a show about solving the mystery of the disappearance but about its human impact. The series is considered by many critics to be one of the greatest television dramas of all time.

Stranger Things (2016) [IMDb: 8.7]

In the 1980s, a young boy’s disappearance in a small town leads to a series of supernatural events. His friends, family, and the local police chief uncover a government conspiracy and a mysterious alternate dimension. The show is a love letter to the sci-fi and horror films of the 80s.

Stranger Things became a worldwide sensation, celebrated for its nostalgic feel and compelling characters. Its blend of horror, science fiction, and coming-of-age drama resonated with a wide audience. The show launched the careers of its young cast.

Black Mirror (2011) [IMDb: 8.7]

This modern anthology series explores the dark side of technology and its impact on our lives. Each episode presents a different near-future scenario, often with an unsettling and thought-provoking twist. The show serves as a cautionary tale about the dangers of our reliance on screens and social media.

Black Mirror has been praised for its clever writing and its timely social commentary. It taps into our anxieties about the modern world and where our technology might be leading us. The show has become a significant part of popular culture.

The Mandalorian (2019) [IMDb: 8.7]

A lone bounty hunter travels the outer reaches of the galaxy in the era after the fall of the Empire. He is hired to retrieve a mysterious child but instead becomes its protector. The series is set in the popular Star Wars universe.

The Mandalorian was an instant hit, praised for its cinematic quality and classic Western feel. The relationship between the Mandalorian and “The Child” (Grogu) became a cultural phenomenon. The show helped launch the Disney+ streaming service and expanded the Star Wars universe.

The X-Files (1993) [IMDb: 8.7]

Two FBI agents, Fox Mulder and Dana Scully, investigate strange and unexplained cases. Mulder believes in the paranormal, while Scully is a skeptic who seeks scientific explanations. Together, they uncover a government conspiracy involving aliens and other supernatural phenomena.

The X-Files became a cultural touchstone of the 1990s. Its blend of monster-of-the-week episodes and a larger, overarching mystery captivated audiences. The chemistry between its two lead characters was a key part of its success.

Dark (2017) [IMDb: 8.7]

This German-language series is a complex time-travel mystery set in a small town. The disappearance of two children exposes the secrets and interconnected pasts of four families. The story unfolds across several different time periods.

Dark was praised for its intricate and mind-bending plot. The show requires close attention from the viewer to keep track of its many twists and turns. It is a masterful piece of storytelling that rewards careful viewing.

Severance (2022) [IMDb: 8.7]

Employees at a mysterious company undergo a procedure that surgically divides their memories. Their work life and personal life are completely separate. A team of office workers begins to unravel the conspiracy behind their jobs.

Severance was acclaimed for its unique premise and its unsettling, surreal tone. The show serves as a commentary on work-life balance and corporate culture. Its compelling mystery and strong performances made it one of the most talked-about new shows.

Battlestar Galactica (2004) [IMDb: 8.7]

This reimagined series tells the story of the last remnants of humanity after a devastating attack by intelligent robots called Cylons. The survivors flee in a fleet of spaceships, searching for a mythical new home called Earth while being hunted by their enemies.

Battlestar Galactica was praised for its dark, complex, and character-driven story. It explored themes of war, politics, and what it means to be human. The show’s gritty realism and intense drama set it apart from other science fiction series.

Firefly (2002) [IMDb: 9.0]

Set in a future where humanity has colonized other planets, this series follows the crew of a small transport ship. They take on various jobs, both legal and illegal, on the fringes of society. The show blends elements of science fiction and Western genres.

Despite being canceled after only one season, Firefly developed a massive and loyal fanbase. Fans loved its witty dialogue, memorable characters, and unique “space western” setting. Its popularity led to a follow-up movie, Serenity, to conclude the story.

The Twilight Zone (1959) [IMDb: 9.1]

This classic anthology series used science fiction and fantasy to explore human nature. Each episode told a standalone story, often with a moral lesson and a surprise ending. The show tackled themes like prejudice, war, and the impact of technology on society, and its clever writing and imaginative plots made it a landmark in television history.

The Twilight Zone became a cultural phenomenon, influencing countless other shows and films. Its iconic opening and memorable stories are still recognized today. The show proved that science fiction could be both entertaining and thought-provoking, setting a high standard for storytelling on television.

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