Task: Question Generation
Input (English): The channel also broadcasts two movie blocks during the late evening hours each Sunday: "Silent Sunday Nights", which features silent films from the United States and abroad, usually in the latest restored version and often with new musical scores; and "TCM Imports" (which previously ran on Saturdays until the early 2000s[specify]), a weekly presentation of films originally released in foreign countries. TCM Underground – which debuted in October 2006 – is a Friday late night block which focuses on cult films, the block was originally hosted by rocker/filmmaker Rob Zombie until December 2006 (though as of 2014[update], it is the only regular film presentation block on the channel that does not have a host).
Output (English): On what day is TCM Underground shown?