Franchise context: The write-up below is from the parent franchise article (anime, book series, or IP) rather than the card game itself. A dedicated CCG profile has not been written yet.
"The Ultimate Showdown of Ultimate Destiny", often shortened to "The Ultimate Showdown", is a comical song and video released on December 22, 2005. The song was written and performed by Neil Cicierega under the pseudonym Lemon Demon, appearing as the fifth single of the project's fifth studio album Dinosaurchestra. The song describes a massive and citywide battle set in Tokyo started by Godzilla and Batman, involving dozens of pop-culture icons and ultimately lasting for a century. The music video's animation was made by Shawn Vulliez.
Source: en.wikipedia.org/wiki/The_Ultimate_Showdown_of_Ultimate_Destiny