Despite the heavy effort and money involved in filmmaking, there are many occasions when a movie is sometimes not released, either because of financial constraints, lawsuits, or death of a star. Here are six movies that had to face this problem:

1. "Dark Blood"

Unfinished for 19 years due to the death of its star River Phoenix, "Dark Blood" is about a young widower who retreats to the desert after the death of his wife due to nuclear radiation. Also starring Judy Davis and Jonathan Pryce as a couple, "Dark Blood" might finally see the light of day as it has recently been completed by its director George Sluizer

2. "Unlawful Killing"

Directed by Keith Allen, "Unlawful Killing" is a British documentary about the deaths of Princess Diana and her beau Dodi Fayed. A cause of controversy, the film suggests that ‘dark forces’ hid the truth regarding Diana’s death and is rumored to be financed by Dodi’s father, Mohammed Al Fayed. It had been claimed that 87 cuts were needed for the film to secure release in the UK due to which it could not be publicly screened.

3. "The Day the Clown Cried"

Directed by Jerry Lewis, who also stars in the film, the movie is about a circus clown who is imprisoned in a Nazi concentration camp, for which it garnered significant controversy. Despite repeated assurances to Jerry Lewis about finances, producer Nat Wachsberger ran out of money before the film was completed.

4. "Foodfight!"

Starling Charlie Sheen, Hilary Duff, Cap’n Crunch, and Chester Cheetah, "Foodfight!: is an animated film set in a supermarket after hours. While the film’s studio claims that it will be released straight to DVD soon, it is also claimed that the movie will be the next "Toy Story."

5. "I Woke Up Early the Day I Died"

A 1998 camp comedy film starring Billy Zane, Ron Perlman and Christina Ricci, the movie is about Zane’s unnamed character who goes on a crime spree while coming in the way of extremely unusual characters. With no dialog at all in the film, the film had to be delayed because of financial constraints.

6. "The Fantastic Four"

Before the current Marvel Studios "Fantastic Four" came out, Constantin Films produced their own low-budget version of the film. Because the studio was about to lose its film rights to "The Fantastic Four," they had to a make a movie even if it were bad and/or never released. Initially budgeted for $30 million, director Roger Corman made it for $1 million, knowing all along that it would never be released.