"Underdog" is a song from Rock Star Supernova's debut album. It is track 6 on the album, and though it was never performed on the television series Rock Star: Supernova, many fans may recognise the song the be the music the final 15 rockers were challenged to pen lyrics for in the very first reality episode. The lyrics however, are radically different to any submission made by the finalists.

The music (without lyrics) was played throughout the performance episodes during and after breaks.