American Chopper: Senior vs. Junior is a reality television spin-off, based on the original series American Chopper, which premiered on the TLC channel on August 12, 2010. The show chronicles the rivalry between Orange County Choppers owned by Paul Teutul, Sr. and his son Paul Teutul, Jr.’s newly opened motorcycle business Paul Jr. Designs. The second season continued with brand new episodes that aired on Monday, August 29, 2011 at 9pm EST on Discovery Channel. The third season began on February 13, 2012. The fourth season premiered, September 3, 2012. November 16, 2012, the Discovery Channel announced the cancellation of the show. The final episode aired December 17th, 2012. Paul Teutul posted a picture of himself with his father and brother Mike all posing in front of the Teutel bike that junior and senior built during season 4, indicating that the final episode will involve a reunion of sorts.

Note: Season 4 dropped the Sr. vs. Jr. subtitle and returned to the original American Chopper title.