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.
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.
On the Chopping Block
S12 E7
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.
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 Junior ponder the idea of building a bike together; Josh builds a bike for the local SPCA, headed by Joanie and Senior.
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.
The OCC crew members are pushed to their limit when they build a pair of contrasting bikes for a client; Junior designs an ethanol-fueled motorcycle; Junior makes a change to the Yankees bike design, and Senior confronts him.
OCC builds a bike inspired by a 1965 GTO, but this massive job may cause Senior to miss the first deadline of his career; when Junior designs a bike for a corporate client, changes in fabrication throw a wrench in the schedule.
When the OCC crew builds an old school chopper for a longtime fan, Senior must rely on Mikey to get the job done; Junior designs an awe-inspiring trike for a repeat client, and father and son come into the home stretch on the Yankee build.
Senior takes a risk by starting a Spartan Race-inspired build before meeting the client, then he has to change course to accommodate the client's requests; Junior designs a monster trike, but trouble with the wheels may mean missing the unveil.
Junior designs a western-inspired motorcycle for country music artist Clay Walker; Senior and the OCC guys build a military-themed bike to be auctioned off to benefit families of fallen soldiers; Senior and Junior assemble the Yankees bike.
PJD begins a build for QUBX while OCC unveils a bike for Wildgame Innovations; father and son continue their collaboration.
New Venture
S10 E7
Senior is on the receiving end of an on-air lecture from a late-night celebrity; Junior launches a new business venture; Senior makes his first ever visit to PJD.
As hurricane Sandy hits, the PJD crew rushes off to rescue the 9/11 Memorial bike; progress on the production bike grinds to a halt when Sr. and Jr. disagree on a plan of action.
Senior, Junior and Mikey donate the TEUTUL bike; Senior pulls a final prank and the threesome takes a raucous ride through the most defining moments of American Chopper.
OCC builds a bike for Veterans Airlift Command and PJD finishes the One Call Concepts bike; following his mother's death, Senior is determined to reconcile with Mikey and Junior.
Junior decides to rework the Black Widow bike he reclaimed from Senior; OCC works on two bikes for John Christner Trucking; Mikey hires a personal trainer.
Junior finally contacts Senior to offer his condolences on Helen's passing; PJD starts a charity build for the March of Dimes; OCC finishes the build for John Christner Trucking.
OCC begins a build that will be unveiled to the Prime Minister of Malaysia; PJD finishes a bike for baseball player Aaron Rowand; Mikey drops a bombshell.
Senior is affected by Mikey's gallery paintings which depict their strained relationship; Junior wins appeal; Senior decides to make a settlement offer.
The rush is on to finish the Cadillac bikes for the father-son build-off; both crews race CTS-V's at the Monticello Raceway; Junior and Senior face each other when they unveil their bikes at GM.
Following the settlement, Senior tries to commission a painting from Mikey; OCC begins a build for a hybrid seed company; PJD works on a build for a medical technology company.
The guys tackle a B-2 bomber bike for Northrop Grumman and one for the NHL; the foundation of the company is rocked by an argument between Paul Sr. and Paul Jr.
In return for having some work done on the shop, Paul Sr. builds bikes for DECA and Col-Met; the OCC crew tries to adjust to working in the shop without Paul Jr.
The guys head to Howe Caverns in New York state to face their fears and explore caves; Paul Jr. continues to work as a consultant at OCC while setting his sights on his own projects outside the shop.
OCC expands its business by partnering with Ducati to put the guys' unique spin on one of the Italian maker's bikes; preparation for a four-day celebration of OCC's 10th anniversary.
The guys face an uncertain future as the Teutul dynasty crumbles; OCC builds an electric chopper for Siemens; Paul Jr. continues to work on building his new company.
OCC is commissioned to build a chopper for the Ornge medical transport company; the team struggles trying to figure out how to build a sidecar capable of carrying the same kind of stretcher found in an ambulance; Paul Jr. Designs project.
Chicago White Sox pitcher Mark Buehrle's wife commissions OCC to build him a surprise chopper to commemorate his perfect game; Paul Jr. continues to work on a project for Coleman, his biggest client.
OCC is enlisted to build a bike for the Iraq Star Foundation, which provides free reconstructive surgery to U.S. soldiers injured in Iraq and Afghanistan.
A client commissions OCC to build a chopper trike; Paul Sr. learns that Mikey is in rehab and wonders if there's any hope of salvaging their strained relationship.
OCC builds a bike for pool champion Jeanette Lee inspired by her "Black Widow" nickname; Mikey is back from rehab and ready to make amends; Paul Jr. explores designing a campaign for an Indy racing team.
The guys are commissioned to build a "wheelchair chopper" for the Christopher and Dana Reeve Foundation; Paul Jr. makes his first visit to OCC in more than four months, but the family divide continues.
The guys work on a chopper for their newest client, Gladiator Garageworks; Mikey tries to face his fears by performing his comedy routine in front of a live audience; Paul Jr. drops in on "The Adam Carolla Podcast."
The OCC guys create their first diesel-powered chopper for Monster Diesel; Paul Jr. attends the grand opening of a dog park that he designed for his hometown of Newburgh, N.Y.
The team designs a NASCAR-inspired chopper for the Stewart-Haas racing team; Mikey participates in JDRF's Ride to Cure Diabetes; Paul Jr. pitches a new line of dog toys.
The guys try to design a bike for Global Gillette in time for the scheduled unveiling without personality problems and assembly issues getting in the way.
Mikey and Vinnie finally get a chance to build their own bike; design ideas include a super-stretch frame, a twin-cam motor and a unique, one-sided swing arm.