MuscleCar is a television program whose hosts demonstrate how to rebuild muscle cars while sharing information about these cars and their history. It became a part of a group of shows called the Powerblock, currently shown on Spike TV, on January 7, 2006.
MuscleCar is a television program that started on Spike TV.
The text says that it became a part of a group of shows called the Powerblock and is currently shown on Spike TV, but it does not specify whether is started on that channel.