Title: The Beastmaster
Content:  Beastmaster began with a screenplay in the early 1980s written by Paul Pepperman and Don Coscarelli. The two writers based their film on Andre Norton's 1959 novel The Beast Master. The writers changed the story dramatically as the original novel had the hero named Hosteen Storm who was a Navajo fighter in a futuristic science fiction setting. Norton was unhappy with the liberties taken with the film's script and asked for her name to be removed from the credits. When Coscarelli signed on as a director, Pepperman became the film's producer and brought in co-producer Sylvio Tabet to the project. 
Title: Beast (2017 film)
Content:  Beast is a 2017 British psychological thriller film written and directed by Michael Pearce, starring Jessie Buckley, Johnny Flynn, and Geraldine James. The film had its world premiere in the Platform section at the 2017 Toronto International Film Festival.
Title: The Beast Within
Content:  The Beast Within was written by Tom Holland, in his first writing credit for a feature film, and directed by Philippe Mora. The film itself is very loosely based on the 1981 horror novel of the same name written by Edward Levy. Producer Harvey Bernhard had purchased the rights to Levy's then-unfinished novel based on the title alone. However, when pre-production for the film began, Levy had still not completed the novel due to marital difficulties. As a result, the film's writer Holland was forced to write most of the film's screenplay from scratch, with the final product differing significantly from the novel. Principal photography officially began on February 8, 1981; in and around Jackson, Mississippi. The entire first week of filming was shot at night outdoors. When filming 
Title: Beastly (film)
Content:  The film is based on Alex Flinn's 2007 supernatural romance novel Beastly, and has been in production since CBS Films bought the rights in December 2007. In February 2009, it was announced by Amy Baer, President and CEO of CBS Films, that Daniel Barnz would direct the film and write the screenplay. Susan Cartsonis produced the film through Storefront Films and Roz Weisberg co-produced it. Initially, the executives wanted a late 2008 theatrical release; however, the WGA strike prevented that possibility. Baer expressed excitement about the director, saying, "Daniel's fresh vision makes him one of the most exciting directors of his generation. We are thrilled to partner with him as he brings his unique voice to arguably the most universally resonant myth in storytelling." Barnz anticipated bringing an indie sensibility to Flinn's story. "It's a very commercial idea 
Title: Beast (2022 film)
Content:  Beast is an upcoming Indian Tamil-language black comedy action thriller film written and directed by Nelson Dilipkumar and produced by Sun Pictures. The film stars Vijay and Pooja Hegde, with Selvaraghavan, Yogi Babu, Shine Tom Chacko, Redin Kingsley, VTV Ganesh, Aparna Das, Lilliput Faruqui, Ankur Ajit Vikal, Sathish Krishnan and Redin Kingsley in supporting roles. The production rights of Vijay's 65th film as lead actor, which was tentatively titled Thalapathy 65, were acquired by Sun Pictures in early January 2020, and the film set to be written and directed by AR Murugadoss. However, the producers ousted Murugadoss from the film in October 2020, after he refused to cut his renumeration. Nelson was later hired, and wrote a new script for the film. 
Title: Beast Beast
Content:  Beast Beast is a 2020 American coming-of-age drama film written and directed by Danny Madden. Based on a 2018 short film titled Krista, also directed by Danny Madden, the film stars Shirley Chen, Will Madden, and Jose Angeles as three young adults whose lives intersect in a suburban town. Beast Beast was executive produced by Alec Baldwin and Casey Bader, and premiered at the 2020 Sundance Film Festival.
Title: Beastly
Content:  Storefront Films, while Roz Weisberg co-produced. Barnz also wrote the screenplay for the film. Although it was the first project picked up by CBS Films it did not end up being their first release (which was the January 2010 release Extraordinary Measures), it was to be originally released on July 30, 2010. However it was postponed until March 4, 2011 due to competitive concerns from other films released on that date and late summer 2010 in general. Neil Patrick Harris played the blind tutor called Will. The movie was critically panned, but it catapulted Flinn's novel to the New York Times Bestseller list (#1) and USA Today Bestseller list, where it remained for several months.
Title: The Beast (1988 film)
Content:  The Beast (also known as The Beast of War) is a 1988 American war film directed by Kevin Reynolds and written by William Mastrosimone, based on his play Nanawatai. The film follows the crew of a Soviet T-55 tank who became lost during the Soviet invasion of Afghanistan. The film has enjoyed a cult-favorite status in spite of its low box office statistics.
Title: The Beast (2001 TV series)
Content:  The Beast is an American drama series that aired on ABC. Created by Kario Salem, the series premiered on June 21, 2001 and was canceled after six episodes.
Title: The Beast (1996 film)
Content:  The Beast is a 1996 television movie starring William Petersen, Karen Sillas and Charles Martin Smith. Aired in two parts as a miniseries, the movie is based on the 1991 novel Beast by Jaws author Peter Benchley. The film is about a giant squid that attacks and kills several people when its food supply becomes scarce and its offspring is killed. It was filmed primarily in New South Wales, Australia.

Question: Who was the screenwriter for The Beast?
Answer: William Mastrosimone.