"Underdog" is the second single by English rock band You Me at Six written by Sam Moss, to be released from their second album: Hold Me Down.

The music video for Underdog was shot at Brixton Academy in December 2009 and was directed by Nick Bartlett.

The music video is a mix of performance shots and a storyline where a ballerina is cheated on by her boyfriend with someone else.

"Underdog" debuted on the UK Singles Chart at number 49 on 14 February 2010, marking the band's third most successful single behind "Finders Keepers" and "Kiss And Tell" which peaked at number 33 and 42 in May and September 2009 respectively.

The song is featured in the soundtrack of Horrid Henry: The Movie, released in 2011,[3] and was also used briefly in the movie when Henry traps Moody Margaret with a water balloon and his yo-yo.