Movie sequels and prequels are becoming more common than ever. At their best, sequels are a win for both the studios that produce them and the audiences who get to enjoy yet another installment of a familiar story. Not all movies are created equal, however, and some sequels leave moviegoers wishing these sequels had never been made.

Major movie studios are almost certain to follow up a successful blockbuster with at least one sequel. It’s a safe investment, financially speaking. Audiences often want to see more of the characters and cinematic worlds that they already know they like. This can be seen in the ongoing success of popular franchises like Star Wars and Batman. These are the best movie sequels of all time.

Sequels can also be lousy, however, letting down fans and sometimes signalling the end of a movie series. Bad sequels can be the result of less competent filmmakers than those responsible for the original movie; the absence of actors who made the original special; or simply a lack of proper financing necessary to make a quality film.

But it’s not just good or successful movies that get sequels. Some bad sequels are even made for movies that weren’t especially well received in the first place. Bad sequels are especially prevalent among the horror or comedy genres. Fans of these types of films may have higher tolerances for “bad” movies and are willing to give sequels a chance if they are in some way tied to a well-known earlier film, even if the original was critically panned. Any recognizability can be a boon to profitability, especially when working in these genres which also tend to be made with lower budgets.

24/7 Tempo has identified the 50 worst sequels of all time based on critic and audience ratings on the Internet Movie Database (IMDb) and Rotten Tomatoes. These are the sequels hated by viewers, professional critics, and sometimes even the people involved in their making — like George Clooney, who regretted his performance as Batman in “Batman & Robin.”

Click here to see the 50 worst movie sequels of all time.

To determine the worst movie sequels of all time, 24/7 Tempo created an index based on each film’s Rotten Tomatoes average critic rating, Rotten Tomatoes average audience rating, and Internet Movie Database average user rating. To be considered, each film needed to have at least 10,000 total user ratings on both IMDb and Rotten Tomatoes, 10 approved Tomatometer critic reviews, and be classified as a sequel by IMDb. Editorial discretion was then used to determine which movies did not fully meet the qualifications of a sequel, such as the case with reboots or film franchises that feature a consistent character but are otherwise unrelated with regards to storyline.