Question: Heavy Metal 2000 is a follow-up to a film which was produced by what two people?
Context: Heavy Metal: F.A.K.K.² is a third-person shooter video game made by Ritual Entertainment in 2000.  A computer game sequel to the "Heavy Metal 2000" animated movie, the game stars Julie in her quest to save her home planet of Eden from GITH, an ancient entity seeking to conquer the universe.  Using a variety of weapons, Julie must now fight off GITH's forces while at the same time uncovering a secret hidden deep within the planet. The History of Heavy Metal ("Hårdrockens historia") is a Swedish 2001 documentary movie made for TV spanning through the timeline of heavy metal music.  It starts with the roots of heavy metal and ends with the metal of present times.  Through interviews and archive material, the movie tries to give answers on many questions, including "which was the first heavy metal band?" .  It was produced by Malik Bendjelloul and edited by Mikael Björnsson and Johan Larsson for Barracuda Film & TV. Heavy Metal is a 1981 Canadian-American adult animated sci-fi-fantasy film directed by Gerald Potterton and produced by Ivan Reitman and Leonard Mogel, who also was the publisher of "Heavy Metal" magazine, the basis for the film.  The screenplay was written by Daniel Goldberg and Len Blum. Deena Weinstein (born March 15, 1943) is a professor of sociology at DePaul University whose research focuses on popular culture.  She is particularly well known for her research on heavy metal music, as she has published two books on the genre: "Heavy Metal: A Cultural Sociology" (1991) and "Heavy Metal: The Music and Its Culture" (2009).  Because of her research on heavy metal, Weinstein was featured in the 2005 documentary "" and the later "Metal Evolution". Kronik is a compilation album released by the Canadian thrash metal/progressive metal band Voivod in 1998 on Hypnotic Records.  It is their eleventh release altogether, featuring remixes, previously unreleased songs, and live recordings.  The album features the track "Ion", which is played during the opening credits of the "Heavy Metal 2000" movie.  It was re-released in 2004 by Candlelight Records. Global Metal is a 2007 documentary film directed by Scot McFadyen and Canadian anthropologist Sam Dunn.  It is a follow-up to their successful 2005 documentary, "".  The film's international premiere took place at the Bergen International Film Festival on October 17, 2007.  "Global Metal" aims to show the impact of globalization on the heavy metal underground as well as how different people from different cultures are transforming heavy metal music. Kekal (sometimes stylized as KEKAL) is a heavy metal and electronic music band formed in 1995 in Jakarta, Indonesia.  According to AllMusic, Kekal was one of the first heavy metal bands from Indonesia to make international inroads, and according to sociologist of heavy metal, Keith Kahn-Harris, was one of the few extreme metal bands from Southeast Asia to ever make more than a minimal impression on the global scene.  Founded by two musicians known simply Yeris and Newbabe, the band underwent some shifts in lineup in its early years, but emerged with a consistent lineup of three key-members, guitarist/vocalist Jeff Arwadi, bassist Azhar Levi Sianturi, and guitarist Leo Setiawan.  Frequently labeled as black metal, progressive metal, and avant-garde metal, Kekal plays a very diverse range of music styles within the frame of metal and rock, incorporating many other music genres such as ambient, electronic, jazz fusion, and progressive rock.  Over the course of its career, Kekal has transitioned from a heavy metal-based style to a more experimental and electronic sound. Heavy metal lyrics are the words used in songs by heavy metal artists.  Given that there are many genres of heavy metal, it is difficult to make generalizations about the lyrics and lyrical themes.  In 1989, two metal scholars wrote that heavy metal lyrics concentrate "on dark and depressing subject matter to an extent hitherto unprecedented" in any form of popular music.  Jeffrey Arnett states that metal songs are "overwhelmingly dominated" by "ugly and unhappy" themes which express "no hope" for the future.  Deena Weinstein has proposed one way to analyze metal song themes is loosely grouping them into two categories: the Dionysian theme (a reference to the Roman God of wine), which celebrates "sex, drugs and rock and roll", partying, and enjoyment of life and the Chaotic theme, which involves dark subjects such as Hell, injustice, mayhem, carnage and death.  Not all metal genres fall into Weinstein's two theme model; for example power metal's lyrical themes often focus on fantasy and mythology, camaraderie and hope, personal struggles and emotions, among other themes.  Another exception is pop metal bands, which replaced "gloom and doom" themes with "positive, upbeat" songs about romantic love and relationships, part of their goal of appealing more to female listeners.  In metal overall, the small number of metal songs about relationships are typically about unions that have "gone sour" long ago. Heavy Metal 2000 (also known as Heavy Metal: F.A.K.K.² outside North America) is a 2000 Canadian-German direct-to-video adult animated science fiction film produced by Jacques Pettigrew and Michel Lemire, and directed by Michael Coldewey and Lemire.  Starring the voices of Michael Ironside, Julie Strain, and Billy Idol, the film is the follow-up to the 1981 animated cult film "Heavy Metal", which is based on the fantasy magazine of the same name.  The story is based on the graphic novel, "The Melting Pot", written by Kevin Eastman, Simon Bisley and Eric Talbot.  The film was made by CinéGroupe, a studio based in Montreal, Quebec. Obús is a Spanish heavy metal band created in Madrid in the early 80s.  They stood out because they took the risk of making a big spectacle in their concerts in order to reach to the level of other international heavy metal bands.  In addition, the lyrics they write and the feelings they transmit connect with the people that follow them.  As they said in an interview: "All our songs , some more and some less, have a meaning".  Far away from renouncing to their genre, they have always claimed that they were a heavy metal band and they even wrote a song about this genre in their first LP called"Dosis de Heavy Metal". In 2012, because of their 30th anniversary, they did a Tour around Spain.
Answer: Ivan Reitman and Leonard Mogel