Ultraman Zero is a fictional character from the Ultra Series. He first appeared in Mega Monster Battle: Ultra Galaxy before starring in his own film Ultraman Zero: The Revenge of Belial and its 2012 sequel Ultraman Saga.

Mega Monster Battle: Ultra Galaxy Legend is a 2009 Japanese superhero film in the Ultra Series. The film released in theaters on December 12, 2009, by Warner Bros. Entertainment Japan. The catchphrase for the movie is "Recover the light of the galaxy!!" . The film is also referred to as Large Monster: The Ultra Milky Way Legend. The film went on to gross $6,161,665 and become the second highest grossing Ultraman movie behind the previous year's entry. It is the first film directed by Koichi Sakamoto, marking the debut of Ultraman Zero and Ultraman Belial.