Best - Top 20 - SciFi TV Series (ET-IT-ID)

SciFi Series that involve extraterrestrials, intraterrestrials or inter-dimensional beings.

The list was made from the rating of the scenarios and implementation of those 3 attributes.

Good series like Terra Nova, Quantum Leap, See Quest and many other do not fit in this category.
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1.
Stargate SG-1 (1997 TV Series)
    1 2 3 4 5 6 7 8 9 10 8.4/10 X  
A secret military team, SG-1, is formed to explore the recently discovered Stargates. (44 mins.)
 
2.
Star Trek: The Next Generation (1987 TV Series)
    1 2 3 4 5 6 7 8 9 10 8.6/10 X  
Set decades after Captain Kirk's five-year mission, a new generation of Starfleet officers set off in a new Enterprise on their own mission to go where no one has gone before. (44 mins.)
 
3.
Babylon 5 (1994 TV Series)
    1 2 3 4 5 6 7 8 9 10 8.2/10 X  
A space station in neutral territory is the focus of a unique five year saga. (45 mins.)
 
4.
The X-Files (1993 TV Series)
    1 2 3 4 5 6 7 8 9 10 8.7/10 X  
Two FBI agents, Fox Mulder the believer and Dana Scully the skeptic, investigate the strange and unexplained, while hidden forces work to impede their efforts. (45 mins.)
 
5.
Star Trek: Enterprise (2001 TV Series)
    1 2 3 4 5 6 7 8 9 10 7.5/10 X  
A century before Captain Kirk's five-year mission, Jonathan Archer captains the United Earth ship Enterprise during the early years of Starfleet, leading up to the Earth-Romulan War and the formation of the Federation. (60 mins.)
 
6.
Firefly (2002 TV Series)
    1 2 3 4 5 6 7 8 9 10 9.1/10 X  
Five hundred years in the future, a renegade crew aboard a small spacecraft tries to survive as they travel the unknown parts of the galaxy and evade warring factions as well as authority agents out to get them. (44 mins.)
 
7.
Farscape (1999 TV Series)
    1 2 3 4 5 6 7 8 9 10 8.3/10 X  
Thrown into a distant part of the universe, an Earth astronaut finds himself part of a fugitive alien starship crew. (50 mins.)
 
8.
Andromeda (2000 TV Series)
    1 2 3 4 5 6 7 8 9 10 6.6/10 X  
Captain Hunt and the crew of the Starship Andromeda set out on a mission to rebuild the Systems Commonwealth 300 years after its fall. (43 mins.)
 
9.
Star Trek (1966 TV Series)
    1 2 3 4 5 6 7 8 9 10 8.4/10 X  
Captain James T. Kirk and the crew of the Starship Enterprise explore the galaxy and defend the United Federation of Planets. (50 mins.)
 
10.
The Twilight Zone (1959 TV Series)
    1 2 3 4 5 6 7 8 9 10 9.0/10 X  
Ordinary people find themselves in extraordinarily astounding situations, which they each try to solve in a remarkable manner. (51 mins.)
 
11.
Stargate: Atlantis (2004 TV Series)
    1 2 3 4 5 6 7 8 9 10 8.1/10 X  
An international team of scientists and military personnel discover a Stargate network in the Pegasus Galaxy and come face-to-face with a new, powerful enemy, The Wraith. (44 mins.)
 
12.
SGU Stargate Universe (2009 TV Series)
    1 2 3 4 5 6 7 8 9 10 7.7/10 X  
Trapped on an Ancient spaceship billions of light-years from home, a group of soldiers and civilians struggle to survive and find their way back to Earth. (43 mins.)
 
13.
The Outer Limits (1995 TV Series)
    1 2 3 4 5 6 7 8 9 10 7.8/10 X  
A modern revival of the classic science fiction horror anthology show The Outer Limits. Episodes often have twist-endings and involve aliens. Sometimes, a story from one episode continues in a later episode. (44 mins.)
 
14.
Battlestar Galactica (2004 TV Series)
    1 2 3 4 5 6 7 8 9 10 8.7/10 X  
When an old enemy, the Cylons, resurface and obliterate the 12 colonies, the crew of the aged Galactica protect a small civilian fleet - the last of humanity - as they journey toward the fabled 13th colony, Earth. (44 mins.)
 
15.
Star Trek: Voyager (1995 TV Series)
    1 2 3 4 5 6 7 8 9 10 7.7/10 X  
Pulled to the far side of the galaxy, where the Federation is seventy-five years away at maximum warp speed, a Starfleet ship must cooperate with Maquis rebels to find a way home. (44 mins.)
 
16.
Star Trek: Deep Space Nine (1993 TV Series)
    1 2 3 4 5 6 7 8 9 10 7.9/10 X  
In the vicinity of the liberated planet of Bajor, the Federation space station Deep Space Nine guards the opening of a stable wormhole to the far side of the galaxy. (45 mins.)
 
17.
V (1984 TV Series)
    1 2 3 4 5 6 7 8 9 10 7.3/10 X  
A year after Liberation Day, courtesy of the red-dust bacteria, the humanoid, lizard-like aliens develop a resistance to the micro-organism and try to regain control of the Earth--only now some humans are knowingly working with them. (60 mins.)
 
18.
Doctor Who (2005 TV Series)
    1 2 3 4 5 6 7 8 9 10 8.7/10 X  
The further adventures of the time travelling alien adventurer, a Time Lord/Lady known as the Doctor who can change appearance and gender, and his/her companions. (45 mins.)
 
19.
Earth: Final Conflict (1997 TV Series)
    1 2 3 4 5 6 7 8 9 10 6.3/10 X  
When an alien species comes to Earth bearing boons to Humanity, a few suspicious humans seek to learn and resist the newcomers' true designs. (60 mins.)
Director: Ross Clyde
 
20.
Sliders (1995 TV Series)
    1 2 3 4 5 6 7 8 9 10 7.4/10 X  
A boy genius and his comrades travel to different parallel universes, trying to find their way back home. (60 mins.)