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Neo - Played by Keanu Reeves, Neo in 'The Matrix' trilogy starts out as Thomas Andersen, unaware he is destined to be The One to bring peace to humanity in a computer-simulated world.

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Marvin the Paranoid Android - In the 2005 film, 'The Hitchhiker’s Guide to the Galaxy,' Marvin the Paranoid Android had such a big brain and strong AI that he just felt too much. The dark humor of a depressed robot having an existential crisis was impeccably portrayed by the late Alan Rickman.

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Roy Batty -

In the 'Blade Runner' films, Roy Batty, model number N6MAA10816, was the leader of a renegade group. His unforgettable demise came about in a fight against Rick Deckard. He was played by the late Rutger Hauer.

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Captain Jean-Luc Picard - Patrick Stewart in 'Star Trek' as Jean-Luc Picard, captain of the USS Enterprise-D, is the epitome of regal, in the sci-fi sense.

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Xenomorph XX121 - The main character and creature of the 'Alien' saga is absolutely petrifying. Both the visual effects and the concept of Xenomorph XX121 will always scar and amaze those who watch 'Alien.'

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Data -

A synthetic life form with AI, Data is incredibly intelligent but lacks human behavioral understanding. He was picked up by the starship Enterprise and became a part of the crew. He is played by Brent Spiner throughout the 'Star Trek' saga.

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Luke Skywalker - 'Star Wars' saga alumni, Luke Skywalker (Mark Hamill) was the protagonist in the original film trilogy. As main figure in the Rebel Alliance, he trained in the Force and became a Jedi Knight.

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Maria - In 1927, 'Metropolis' portrayed a futuristic city with a class divide. Maria, a human-turned-robot played by Brigitte Helm (1908-1996), is distinct for being way ahead of its time.

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E.T. The Extra-Terrestrial - One of the cutest and kindest of all the sci-fi characters would have to be E.T. A tiny Drew Barrymore and her siblings attempt to help the weird little alien to escape Earth and get back home.

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Imperator Furiosa -

Immortan Joe's best enforcer, commander of his war rig, and a fierce warrior, Furiosa, played by Charlize Theron in 'Mad Max: Fury Road,' is commissioned with returning escaped women to her oppressive master. Instead, she heads a biblical race against all of his warriors to lead the ladies to their freedom.

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T-800 - Arnold Schwarzenegger's role in 'Terminator 2' as the T-800 portrays the rare, terrifying and heartwarming role of a killer robot learning human emotion, but realizing he can never have it himself.

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Malcolm Reynolds -

Stemming from the series 'Firefly,' Nathan Fillion's role as Malcolm Reynolds in 'Serenity' is iconic as one of sci-fi's most lovable rogues.

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Klaatu -

'The Day the Earth Stood Still' of 1951 was revolutionary in its day. In contradiction to H.G Wells' 'The War of the Worlds,' this film depicts an alien attempting to teach Earth to reduce warfare. The pacifist alien was called Klaatu, and was played by Michael Rennie (1909-1971).

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Sarah Connor -

Sarah Connor from the 'Terminator' films starts innocent and turns into a hardcore warrior. The role was played by Linda Hamilton.

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Khan Noonien Singh -

After genetically superior Khan was marooned by Captain Kirk 15 years prior, he was keen to get his hands on the USS Enterprise in 'Star Trek 2: The Wrath of Khan'. Played by the late Ricardo Montalbán (pictured), Khan was a threat to the starship and a battle ensued, with Khan eventually losing to Kirk's experience with the Enterprise.

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Marty McFly and Doc Brown -

Throughout the 'Back to the Future' trilogy, this unlikely duo—Marty, a cool teenager of the '80s, and Doc, a brilliant, over-caffeinated professor—travel back and forth in time trying to correct the errors of Marty's first time-traveling goal of graduating and getting the girl. The roles were played by Michael J. Fox and Christopher Lloyd, respectively.

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Rick Deckard - Harrison Ford makes it onto this list for his role in 'Blade Runner.' Playing Rick Deckard, based in the future, he is a working man who hunts illegal replicates across cyber-punk Los Angeles.

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Boba Fett -

'Star Wars' saga's Boba Fett, portrayed by the late Jeremy Bulloch, was supposed to be one of the most dangerous men in the galaxy, ready to get brutal at a moment's notice. He known for saying very little and for his distinct T-shaped visor.

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Max Rockatansky -

The 'Mad Max' saga is a heck of a ride, and in this apocalyptic landscape, loner Max Rockatansky knows exactly how to play rough. The main character was played by Mel Gibson in the original trilogy, and then by Tom Hardy in the recent 'Mad Max: Fury Road.'

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Alex Murphy -

'RoboCop' is one of those sci-fi movies that was inevitable: a secret organization gives a man a second chance at life by rebuilding him as a robot. But not just any robot, Alex Murphy became RoboCop, programmed to fight crime. This story follows RoboCop as his memories begin to resurface and his human side wants revenge. The role was played by Peter Weller (1987) and later Joel Kinnaman (2014).

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Captain James T Kirk - Played by William Shatner, the captain of the starship Enterprise of 'Star Trek,' Captain James T Kirk was the charming, charismatic leader of the crew.

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R2-D2 - Silent savior, R2D2 of the 'Star Wars' saga always manages to steer everyone back on track at least once in every film. This robotic hero was both played by Kenny Baker (1934-2016) and Jimmy Vee.

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HAL 9000 - HAL 9000 in '2001: A Space Odyssey' was decades ahead of its time. Sci-fi during this time focused on aliens and atomic weapons, but a sentient computer villain was far from everyone's minds until Douglas Rain (1928-2018) voiced the terrifying A.I. system.

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Rocket and Groot -

'Guardians of the Galaxy' power duo Rocket (an anthropomorphic raccoon) and Groot (a tree-like being with limited language) were an odd pairing of outcasts that got the job done, with some comedy along the way. Groot was voiced by Vin Diesel, and Rocket was voiced by Bradley Cooper, with motion action by Sean Gunn.

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Yoda -

The 'Star Wars' saga is full of highly memorable characters, but Yoda was the mentor that proved that with patience and failure comes greatness. Puppeteer and voice actor Frank Oz portrayed the original Yoda.

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Ellen Ripley -

Throughout the 'Alien' saga, Sigourney Weaver's portrayal of Ellen Ripley was incredible. However, the character herself was the definition of a bad-a** hero.

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Han Solo - Played by Harrison Ford, Han Solo of the 'Star Wars' saga became the lovable rogue that everyone wished they could be. With the exception of his friend Chewbacca, the loner and smuggler only looked out for himself.

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Spock -

Legendary 'Star Trek' character Spock, of mixed human and Vulcan descent, serves aboard the starship Enterprise, and was known for his look and his interesting demeanor. First played by iconic Leonard Nimoy (1931-2015) in the original series and films, Spock was later played by Zachary Quinto.

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Darth Vader -

Since the first film, Darth Vader has always been a fan-favorite in the 'Star Wars' saga. His attire, his voice, and his battle with the dark and light captivate fans of any age.

See also: 30 most influential American sci-fi writers

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