South Park character
Billy Marsh
Gender male
Hair black
Birthday September 1, 2029
Age 6
Voiced by Trey Parker
First Welcome to the Future
Last Welcome to the Future

William Randall "Billy" Marsh is the future son of Stan Marsh and Wendy Testaburger.


Billy Marsh resembles Stan alot in many ways. He is named after the name that Marvin Marsh used to call Stan in "Death". He wears a brown shirt and blue jean, similar color of apparel that Stan wears. He is friends with Dylan Broflovski, Andy Stotch, Adolf Cartman, and Tommy McCormick.


  • Even though he is said that he is the future son of Stan and Wendy, the future always changes and it is possible that he won't be born along with his friends.
  • In the episode, "Death", Grampa Marsh mistook Stan's name to be Billy, which is where Billy's name comes from.

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