What can you add to this list?

[Svengoolie 3]

https://www.digitaltrends.com/movies/worst-movie-sequels/

They picked some ghawdawful sequels for this list,  can we add to it?

How about...

Every alien movie after Aliens?

The thing 2012. How did the film oft he ship exploding get to the Norwegian camp???

Indian Jones and the temple of doom.  An insult to intelligence and women,  not to mention the people of India all in one package.

[LilCerberus]

300: Rise Of An Empire had to rely on going directly against everything that was established in the first movie.

[The Burgomaster]

I wholeheartedly agree with EXORCIST II, GREASE 2 and CADDYSHACK II (they are all on my worst mainstream movies of all time list). Here are a few for consideration:

* THE STING II
* DEATH WISH 3
* ROCKY IV
* JAWS 3-D
* MORE AMERICAN GRAFFITI

[Rev. Powell]

Where's THE PHANTOM MENACE??

I disagree about EXORCIST II: THE HERETIC. While it's not technically a "good" movie, it is a hell of a lot of fun.

I'd also add HIGHLANDER II: THE QUICKENING.

[RCMerchant]

While KING KONG (1976) wasn't all that great, it's still miles above KING KONG LIVES (1986).

[indianasmith]

THE RING II was an insult to a brilliant film.

[bob]

Rocky 5

Saw 7

The Whole 10 Yards

Blair Witch 2: Book of Shadows

Batman and Robin

Daddy Day Camp

Major League 3

Mortal Kombat: Annihilation

Star Wars Episode 2: Attack of the Clones

[FatFreddysCat]

Jaws 3-D was a stink burger, but it looks like the Royal Shakespeare Company compared to Jaws: The Revenge

Some others off the top of my head:
C.H.U.D. II: Bud the Chud
Poltergeist III
Pretty much any Amityville movie after "II"

[RCMerchant]

Any of Franco's Orloff films after the AWFUL DR. ORLOFF are awful!
the SATANIC RITES OF DRACULA was a low point in Chris Lee's Dracula series.
Most of the FRIDAY the 13th movies after 3. JASON TAKES MANHATTAN being the lowest of them.
The HALLOWEEN movies besides the first and III.

[RCMerchant]

the AIRPORT movies after the 1st one.
The sequel to Wes Craven's original the HILL HAVE EYES is bad. The dog has a flashback!  
I didn't care for 2010 or the FRENCH CONNECTION II.
the 2 sequels (well, one was a prequel) to DUMB AND DUMBER.