I've been thinking of compiling a list and writing an article about sequels that were at some sort of planning stage (either announced, or writer hired or release date set or something else solid), but then cancelled. I don't mean sequels that people just hope(d) for, but that didn't happen like Dredd 2 or Hellboy III, but actual cancelled sequels or sequels with zero progress in many years.

Off the top of my head I can think of:

City of Ashes
RED 3 (writer was hired)
The Amazing Spider-Man 3 (and 4)
Inside Man 2
Fantastic Four 2
Terminator: Genisys sequel
Superman Returns sequel
Rambo 5 (though I guess this might still be revived now that Sly did not win the Oscar)
Mrs. Doubtfire 2
Vampire Academy 2
Eastern Promises 2
School of Rock 2
The Subtle Knife
Wild Hogs 2
Airplane III
Old School 2
The Break-Up 2

Halloween: Asylum (Matt Venne)
Halloween II (Alexandre Bustillo, Julien Maury)
Halloween 3D (Todd Farmer, Patrick Lussier)
Halloween Returns (Marcus Dunstan, Patrick Melton)

According to Arnold, the TG sequel is still on, but yeah, it's probably a matter of time.

Spider-Man 4
Jinx (spinoff technically)
Ghostbusters 3 (sorta)
The Golden Compass

The Subtle Knife is The Golden Compass 2. But thanks for the others.

TDS, first time I read about Halloween:

Asylum (Matt Venne)
Halloween II (Alexandre Bustillo, Julien Maury)

Can you shed a few words?

Only thing I know about Halloween II with the Inside guys is that Sheriff Brackett was revealed to be Laurie's biological father.

Asylum was a truly awful script where, after a failed attempt at executing Michael Myers, Smith's Grove Sanitarium goes into lockdown. A nurse there is the main character as she tries to keep ahead of Michael and not be murdered by one of the other loonies in the asylum. Charles Cyphers' Brackett was in this draft, and he stuck around just long enough to die.

X Men Origins : Magneto
Superman Lives (Nic Cage version)
Sinister Six
Wanted 2
The Vega Brothers
Austin Powers 4/Dr Evil Spinoff

I am not sure The Vega Brothers and Austin Powers 4 ever got anything official...

Thanks.

At what point in the Halloween franchise was Asylum supposed to take place?

No they just never happened.

Though there certainly was talk of the fourth AP film being a Dr Evil one but not sure how far that went.

The Tin Tin sequel, i remember it was supposed to be directed by Peter Jackson but after the first one disappointed at the B.O i guess it was scrapped.

Jamie Bell said last year that shooting would likely start at the end of 2016.

batman unchained

I thought it was called Batman Triumphant.

I think such a list is nearly endless.

Also

I Am Number Four sequel

The Mortal Instruments: City of Bones sequel

That is City of Ashes.

There was an Inside Man 2?

Aren't there a bunch of sequels to Miramax movies that were announced after some deal? Crouching Tiger 2, Bad Santa 2, Trainspotting 2 and some other random crap.

Would have liked to have seen Golden Compass 2.

Would the Narnia movies count? I'm sure they planned more.

Kung Fu Panda/Shrek- lots of Dreamworks movies were announced as multi-part series.

National Treasure 3? The actual non-Alien Prometheus...okay being facetious.

Crouching Tiger 2 is out, the other two are being shot this year.

BBC is now making a mini series.

Mac and Me 2.

And there were various stages of development for both The Silver Chair and the Magicians Nephew. The Silver Chair's script has been finished, but it has no studio willing to greenlight production.

I think the only thing to do with Narnia is make a new miniseries like the one from the 80's, but make all 7 books instead of just four.

http://screenrant.com/chronicles-narnia ... ir-script/

The sequel(s) to Ralph Bakshi's Lord of the Rings.

Ones not said yet, that I can think of.

The phantom
Rocketeer
Roger Rabbit: the Toon Platoon
Beetlejuice goes Hawaiian
Dick Tracy 2
ET 2
John Carpenters Hallowen 4 (he still tried to keep it anthology before selling all rights)
Escape from Earth
Spielberg's Jaws 2 and Night Skies
The long Kiss Goodnight
Kill Bill 3
Police Academy 8 (A semi reboot that bring back a lot of the vets)
Three Men and a Bride
Charlie and the glass elevator
Mary poppins (Disney got stopped)
Lethal Weapon 5
Beverly Hills Cop IV
Alien 5
A very dark Pee Wee Herman film
The Bone Collector
Property of a Lady (Dalton's third 007 film)
Harrison Ford's third Jack Ryan film
Jurassic Park 4 (I remember the humanoid hybrid script)
The brazillion Job
The Topeka Affair
More trouble in little China
True Lies 2
Triplets
Predator 3 (possibly back on but definitely not the same incarnation)
King Conan??? Is it still on

It was a sequel to Halloween: Resurrection. Michael killed Busta Rhymes in the opening scene.

Halloween 9 had always been rough.

There was also scripts that took place on a movie set, and I think they were trying to bring back Josh Hartnett, or or at least come back with the character.

Also forgot:

Goonies Never Say Die (Starts at one of their funerals, lol)
Naked Gun 4 was being developed at the time of Neilson's death
Spaceballs 3: The Search for Spaceballs 2
Unbreakable (I remember they were toying with the idea at least)
Crimson Eagle (Romancing the Stone 3)

Josh Hartnett was in early drafts of Asylum, though he wasn't in the version I read.