When does American Chopper return?

The series centered on Paul Teutul Sr. (frequently called Senior), and his son Paul Jr. (also known as Paulie or simply Junior), who manufactured custom chopper-style motorcycles. The contrasting work and creative styles of the father-and-son team were the series' hallmark until 2008 when an explosive argument led to Paul Jr.'s termination and departure to start a competing chopper company. The series originally aired on Discovery Channel beginning in March 2003. In December 2007, the series moved to Discovery's sister channel TLC, starting off with an 18-hour marathon.