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Senior and Junior begin restoring a 1951 Buick, but they don't always go by the book; Senior risks everything by moving designs away from their famous choppers; Junior challenges himself to build a streamlined bike for the MLB Network.

Junior designs a bike inspired by a futuristic big rig, but the massive amount of fab crushes his schedule; the OCC team builds a vintage military-style bike with sidecar to benefit a foundation for wounded veterans.

Senior goes back to his roots, designing a throwback brand of affordable motorcycles, to sell out of the OCC Showroom: Junior challenges himself to build a bike using multiple aluminum parts.

OCC builds an aggressive paintball bike, but Senior and Josh have creative differences; Junior designs a farm-inspired bike with a surprise element; Senior and Junior attempt to get the Buick running and celebrate Junior's birthday.

Senior takes on a build for a Vietnam memorial, determined to create a bike worthy of history; Junior is hired by Martin Guitar to design a massive reverse trike, an undertaking that pushes his team to their limits.

Senior and his team struggle to deliver a vintage-style bike on time. Junior deals with the complicated assembly of the Martin Guitar reverse trike. Senior surprises Junior with the first theme bike they ever built.

Junior designs a monster trike and takes a huge financial gamble. Senior and his team struggle to build two bikes in three weeks for a Florida resort. Senior and Junior ponder the idea of building a bike together.

Junior attempts his first ever dually trike. Senior and his team struggle to build two bikes in three weeks. The Teutuls cruise the Buick through Senior's old stomping grounds.

Father and son come together to build one last bike in the old building.