Os Under-Undergrounds (English: The Under-Undergrounds) is a Brazilian flash animated series created by Hugo Oda and produced by Tortuga Studios. The first season premiered in Brazil on Nickelodeon on May 9, 2016.
The story begins when Heitor Villa-Lobos, a teen guitarist, is kicked out of his band as a result of his former bandmates' greed. On returning home, he accidentally falls into a hole that leads him to an underground world inhabited by mutants. Once there he meets Layla and her friends, Lud and Bob, who make up a rock band called "Under-Undergrounds". Heitor befriends the trio and joins the band, while at the same time seeking help to find his way back to the surface and his home.