S12, EP10 "Bonkers in Yonkers"
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.
S12, EP9 "You're My Dog..."
Junior designs a monster trike and takes a huge financial gamble; Senior and Junior ponder the idea of building a bike together; Josh builds a bike for the local SPCA, headed by Joanie and Senior.
S12, EP8 "Strikes and Reverse Trikes"
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.
S12, EP5 "Guitar Hero"
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.
S12, EP4 "Splat!"
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.
S12, EP3 "Senior's Moment"
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.
S12, EP2 "Teutul Recall"
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.
S12, EP1 "Chopper Up the Middle"
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.