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The biggest one for me is Mindhunter, a brilliantly atmospheric crime drama from David Fincher, I realise it's not exactly cancelled as such but it will be a big shame if a third series never happens.
The OA, brilliantly weird but Netflix being Netflix decided to drop it in favour of some other flavour of the month.
The Expanse, it's amazing that the home of the likes of Sharknado had such a gem and gave it up only for Amazon to take it over before promptly giving it the boot too.
An honourable mention to cross dimensional spy thriller Counterpart, dropped because it was too manly....
Any more?
Dungeons and Dragons.
Firefly.
In general most series should end before viewers tire of them, even some greats have gone on for far too long. Thankfully the wire only did 4 seasons and left us wanting more.
Firefly, obviously.
Jinx.
One that gets mentioned a lot, Firefly. Agree with Mindhunter too, it’s a great series.
I came here to say firefly.
Didn't expect to see it mentioned so soon.
Also Banshee
Boardwalk Empire for me if only for the fact they knew they'd been cancelled so tried, and failed to tie up loads of in depth threads in the finale season. I was always a slow burner so to rush the finish ruined the whole story IMO.
Firefly, obviously.
Lie to me with Tim Roth was another great one.
Loved "Finder" with Greg Stults, only lasted one season.
Let me be the first to mention Firefly.
Oh…
Loved “Finder” with Greg Stults, only lasted one season.
That's a good call, although I suspect we might be the only two people who watched it, so probably not surprising it was cancelled.
Lie to me with Tim Roth was another great one.
Loved that series.
Just watched the last one of Bull that I've always enjoyed.
Yes, Minister
police squad
Jericho .. I really liked that back in the day
The Wire was five seasons.
Gangland Undercover should never have been cancelled - based on true story and the main character goes on to infiltrate another bike gang.
Altered Carbon
Archive 81
Mongrels
Yes, Minister
Should someone mention “Yes, Prime Minister” at this point?
Firefly
Utopia (the brit version)
Rome
Deadwood
Space Above & Beyond
Jericho
And yeah

Why Don't You.
The Expanse final series was far too short.
Krypton Factor
Treasure Hunt

We as a family use to all love:
Primeval
Atlantis
Hardcastle and McCormack
The Big Breakfast
Treadstone...suspect it was bobbins but I ended up getting taken in by it. Not really sure where it would have gone though, 1 big surprise at the end really that hopefully would get answered.
I'm not an animal
Yes, Minister
I would love there to be more Yes (Prime) Minister in the world and I should really put it in the ‘tv you evangelise about’ thread, but I wouldn’t say it felt like it was cut short before it’s time. I’d rather it as it was than overstaying its welcome.
And firefly, obviously
Crossroads
The Expanse ran the full length of the novels in the first arc. All the books after that point are set almost 30 years in the future but with the seams people. It wouldn’t work.
Altered Carbon.
Firefly.
Almost Human.
Stargate Atlantis and Universe.
Ah, Space Above and Beyond. OORAH!
Kickstart.
At least Jericho was able to get a second season, only 7 episodes, to tie up some loose ends, and Firefly got a movie that gave some closure.
Containment - a pretty solid pre-covid quarantine drama - only got one and certainly if the producers know this at the time they acknowledged they would have ended it differently.
Similarly Dark Skies was a great ufo conspiracy series and only got one season, had a story arc for five, I think this and Jericho were probably before their time and would find a place on streaming platforms today.
The Tick, well I enjoyed it. We never quite found out what makes him.. Tick..
Going back a good few years, but does anyone remember flashforward? It was a good story and had the potential to develop into a great series but they scrapped it after 1 season.
Stargate Universe (the Robert Carlyle one).
Knowing me, knowing you
2 others i liked
brimstone (tv series with lori petty) and garth meringue's darkplace
edit just thought of millenium too (with lance henriksen)
Pushing Daisies
15to1 in its original half hour format.
Firefly
Pushing Daisies
Dead Like Me
The Sarah Connor Chronicles
Person Of Interest
Deadwood
Does anyone remember Outlaws, a series starring Phil Daniels as a jobbing legal aid lawyer? I remember really enjoying it for it’s dark humour and gritty style. It may not have aged well, but I was very surprised that it only got one season.
Kickstart
And Junior Kick-start!
4400. I really wish I’d known they had net wrapped up the ending before I invested in watching 4 seasons of it. I think there was a reboot but not seen it, I’m still too bitter.
It’s a Knockout. I’m guessing that H&S, risk assessments and the like would make it difficult these days?
It’s a Knockout
Well, I suppose you have Total Wipeout* and the wonderful Takeshi's Castle
*Although I believe they had to film it in Brazil to get round H&S requirements.
Game of Thrones. Loads of lips appearing on YouTube for me, reminding me how fantastic it was, up until it wasn't. So much more mileage was available from everything that had been set up till the final season blootered it.
Randall and Hopkirk (Deceased)
Tiswas
Warrior Nun, obviously
Warrior Nun just spent most of her time getting her arse kicked.
Was going to say The thick of it.....but the current gov are doing an excellent job keeping it going
Fraiser.
But I dread how bad the comeback this year might be... It's going to be awful, like Star Trek Picard decades after Next Generation, isn't it? 😥
Rentaghost
It’s a Knockout. I’m guessing that H&S, risk assessments and the like would make it difficult these days?
That and Project Yewtree.
That and Project Yewtree.
😂
Game of Thrones
It wasn't cancelled. The scriptwriters couldn't be bothered finishing it properly so they just phoned in the final couple of seasons. I would have been much better if it had been cancelled when Tywin Lannister got killed, it was all downhill after that.
Eldorado
Does anyone remember a sci-fi series called (iirc) Hunters ? I really enjoyed that
Team of humans tracking down aliens in human form , that communicated with a series of clicks. Except one of the humans was in fact one of the aliens
Raised by wolves
Seems a lot of the streaming services get expensive series to get subscribers then cancel once people have signed up.
Agree with WDY and Kickstart. How about Swap Shop, Dick Emery and Benny Hill?
Rainbow
Triangle 😉
The Sarah Connor Chronicles - was just getting really good when the writers strike killed it off.
Pretty sure Sliders went the same way....
Stargate Universe (the Robert Carlyle one).
Forgot that one, another that ended mid story....
Six million dollar man
Space 1999
Jim'll fix it erm.. no, hang on…
To be fair, just for one moment ignoring the hideous predatory sex offender, the concept was ace. I’m kinda sad that it’ll never come back due to the festering piece of shot of who hosted it.
Firefly.
Has anyone said Firefly yet? I really liked Firefly, thought it ended way before it's time.
So, Firefly.
TBH space1999 was rebooted for the us market in season 2 which probably killed it off.
Forgot that SU never actually finished as I always get it mixed up with Atlantis.
What bugs me more is leaving it too late to do the sequels people wanted, like Star Wars or India jones.
Eldorado
I liked Eldorado, Marcus, Marcus.
I’m vaguely thinking of making a pilgramage to the set 🙂
Forgot that SU never actually finished as I always get it mixed up with Atlantis.
Really enjoyed Stargate Atlantis and they finished it off nicely as well.
Kickstart
☝️
CountZero
Person Of Interest
I'd love this to have continued but I think they kind of ran out of ideas and it came to a logical conclusion - shame as I really enjoyed it.
Kickstart and Junior Kickstart could easily be resurrected - Would love that - though it does prompt the question as to how it/they ever got commissioned in the first place? Must have been some trials fans in the Beeb back in the 70/80s.
I remember being took to a trials thing as a kid in the 7o’s, I think my dad was looking for a hobby for me, or more likely fancied one himself.
The kitchen being refitted and a new motor bike appearing was a pretty common thing in our household.
Kickstart
And Junior Kick-start!
And Paddles-up
Good call!
Final Space
Talking of Robert Carlyle - Cracker. The episode with him in was brilliant