23 Best Adventure/Sci-Fi/Action Tv Shows
In alphabetical order

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24
Elements of interest: Fast paced action, technology, espionage

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Angel
Elements of interest: Demons rather than vampires, atmosphere, Fast paced

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Bonekickers
Elements of interest: Forensics, passing of time, archaeology, conspiracy

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Buffy The Vampire Slayer
Elements of interest: Vampires, atmosphere, books and prophecies, librarian

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CSI: NY
Elements of interest: Detailed forensics, technology, fast paced

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Dark Angel
Elements of interest: Season 2 best, genetic engineering, the future, societal impact

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Fortune Hunter (1994)
Elements of interest: Very early detailed creative forensics

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JAG
Elements of interest: High budget, mood, comfort, story telling

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La Femme Nikita
Elements of interest: Top secret agency, technology, forensics, unusual techniques, smart characters, espionage

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Lois and Clark The New Adventures of Superman
Elements of interest: Comfort, mood, story telling, atmosphere

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LOST
Elements of interest: Labyrinthian story, lots of episodes=lots of interesting detours/details, archaeology

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Now And Again
Elements of interest: Great humour, realism, acting, technology, high quality

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Nowhere Man
Elements of interest: Paranoia, great conspiracy, mindbend, smart main character

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Robocop
Elements of interest:

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Seven Days
Elements of interest: Alternate futures, technology, interesting scenarios

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Special Unit 2
Elements of interest: Great sarcastic humour, mood, atmospere, interesting paranormal villains

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Sliders
Elements of interest: Season 4 and 5 best because more naturalistic. Lots of interesting alternate dimensions.

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Star Trek Enterprise
Elements of interest: Fast paced, technology, forensics, transition from NASA -> Star fleet, early days, more naturalistic/realistic.

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Surface
Elements of interest: Very interesting story overall about aliens (sort of), genetic engineering, mindbend, detours. Technology.

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The Outer Limits (1995)
Elements of interest: Runs the gamut through all of science fiction and even horror from aliens to time travel to future space travel to diseases and genetic engineering.

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The X-Files
Elements of interest: Naturalistic, conspiracy, aliens, atmosphere.

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Threshold
Elements of interest: Cameras, forensics, alien technology, genetic mutations, technology

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The Twilight Zone (2002)
AKA the mindfuck TV show. Every episode is a mindfuck, great creative. Technology, naturalistic, created by same people as Outer Limits 1995. Similar style.

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Veritas: The Quest
The best Tomb Raider/Indiana Jones/Forensics/Archaelogy tv show. Grand in scale, lots of technology, forensics, cameras and analysis, ancient tombs and catacombs and supernatural elements and vast conspiracies. #1