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A look back at the series.

Source: Discovery Channel

In the season premiere, Senior proposes that he and Junior collaborate to build a bike for charity.

Source: Discovery Channel

Senior and Junior decide to recreate the first bike they ever built together in their garage before Orange County Choppers. PJD reveals the GEICO Armed Forces tribute bike and the OCC Cafe opens.

Source: Discovery

Senior and Junior reminisce while working on their big bike build; PJD begins work on a trike; and OCC builds a bike for Senior's favorite charity.

Source: Discovery Channel

Senior and Junior bond during their bike build; OCC begins working on a bike for Wildgame Innovations; PJD reveals a five-wheeled trike for Loopster.

Source: Discovery Channel

PJD begins a build for a technology company; OCC unveils the Wildgame Innovations bike; Senior and Junior continue their bike build.

Source: Discovery Channel

OCC begins a build for the Sturgis Motorcycle Rally; PJD unveils a bike that was built for a technology company; and Senior and Junior complete their bike build.

Source: Discovery Channel

Senior receives a stern, on-air lecture from a late night celebrity, Junior launches a new business venture and Senior visits PJD for the first time ever. Then, at Sturgis, Senior rides side by side with a bike industry icon.

Source: Discovery

Junior and Senior discuss potential future business collaborations; PJD finishes a bike for RoadLoK; and OCC begins a super-bike build.

Source: Discovery Channel

Senior and Junior don't see eye to eye while brainstorming ideas for their production-bike project.

Source: Discovery Channel

Senior makes business decisions without Junior's approval; PJD and OCC unveil projects.

Source: Discovery Channel

Junior and Senior disagree on the production bike design process.

Source: Discovery Channel

The 9/11 Memorial bike is endangered by Hurricane Sandy. Also: Senior confronts Vinnie about their differences.

Source: Discovery Channel

PJD's 911 Memorial Bike is in more hot water than they thought. The pranks leading up to Chopper Live rev up and Sr. and Jr. hit a snag when the production bike discussions open old wounds.

Source: Discovery

In the series finale, the crews are under pressure to finish the 911, GAF and Venetian bikes. Cody goes after OCC with a revengeful prank as Chopper Live draws near. Sr and Jr find common ground in their relationship but are at odds over the new company.

Source: Discovery Channel

Memorable moments from the series are recalled. Also: Senior, Junior and Mikey donate a bike.

Source: Discovery Channel