Underdog

An underdog is:

Underdog (sociology) in sociology a standing at the bottom of society person
In an extreme sports underdogs
Underdog ( TV series), a superhero in a TV series
Underdog - Undefeated because he flies movie title the Disney adaptation of the series
An alternate name for the breed of dog turnspit Dog
The title of a book by Markus Zusak

Further use of the term

Home of the Underdogs is one of the largest and best known internet collections of abandonware.
The Underdog Show is a television production of the BBC, compete in the dogs with their owners in the excretion processes from one another.
The Underdog Project is a music project by Toni Cottura
The Underdogs is a musical charity project from New Zealand