Michael J. Nelson is an American writer, comedian, and filmmaker, best known for his work on the television series Mystery Science Theater 3000. He gained popularity for his role as a host and writer, where he provided humorous commentary on low-budget films. In addition to his work on Mystery Science Theater 3000, Nelson has contributed to various other projects, including the film This Island Earth and the web series RiffTrax. He has also authored books and continues to engage with fans through live performances and online content.