Secret Sound Underground - 2013 was released on:
USA: February 2013
Secret of the Underground Passage - 1911 was released on: USA: 14 October 1911
Modern Marvels - 1994 Secret Underground 17-7 was released on: USA: 10 December 2010
The Secret Lives of Sock Monkeys - 2004 was released on: USA: 13 November 2004 (San Francisco Underground Short Film Festival)
Underground - 1972 was released on: USA: 1972
Welcome to the Underground - 2011 was released on: USA: 2011
The Underground - 2006 was released on: USA: 14 September 2006
The Underground Railroad - 2014 was released on: USA: 2014
XM Underground - 2008 was released on: USA: 2008
UnderGround - 2012 was released on: USA: 11 October 2012
Her Velvet Underground - 2014 was released on: USA: May 2014
Inspirations from the Underground - 2012 was released on: USA: October 2012
The Sounds of the Underground - 2007 was released on: USA: May 2007