Then, the unthinkable happened: Sr. fired his son from the company, which ultimately lead to the show's apparent Cancellation. But what seemed like the end of the saga, turned out to be just the beginning of a wholly new series, American Chopper: Senior vs. Junior. This continuation has a similar formula, but this time, the arguments between father and son are Serious Business. As in, Paul Sr. does everything he can to put the workshop of his son, Paul Jr. Designs, out of business.