After such a big battle, you'd think the show would be done. But it's back, in this season premiere of Senior vs. Junior. Senior is well-rooted for battle, but Junior plans on destroying his dad's business regardless; by building a rival shop just around the corner. Of course Mikey will be there along with an old friend Vinnie.

Paul Jr and team are hard at work trying to get the new shop in order. Senior is in total disbelief that Junior will be able to compete with OCC. Also Senior get's angry when Junior starts going after OCC's vendors.

Sr. and Jr. find themselves in front of a judge because Sr. is suing Jr. for his 20% ownership of OCC. Meanwhile, the team at OCC is hard at work on a chopper for ESAB, one of the oldest welding equipment companies in the country.

The guys at OCC are tapped to build the ultimate vehicle for the Science Channel's Meteorite Men. A tragic accident at Paul Jr. Designs prompts Senior to put his differences with his sons aside and he reaches out to Junior and Mikey.

OCC builds a ramp to launch a dummy dressed as Junior over a creek. Meanwhile, Junior and his team begin fabricating their very first chopper. Junior realizes that he needs help in the paint department so he recruits his old friend Nubs to the team.

Senior and the team at OCC are tapped to build a bike for the FBI and the local Newburgh Police Department. Meanwhile the guys at PJD are furiously attempting to fabricate both the Geico bike and the Anti-Venom bike in time for the bike rally in Sturgis, SD.

The pressure is on at OCC and Paul Jr. Designs as both shops race to complete their bike builds in time for the famous Sturgis bike rally.

OCC and PJD arrive at Sturgis to face off for the first time to see who will have the better bike. Junior wonders whether Senior will show his support by attending one of his reveals, but Senior has no interest in seeing either of his son's first bikes.

Paul Senior, Paul Junior and Mikey take a look at how their family has fallen apart.

It's wedding bell bliss as Paul Jr. prepares to head down the aisle while PJD becomes swamped with e-mails from people interested in his bikes. But will Junior regret inviting his dad to the festivities?

OCC gets a bike build for the Chicago Blackhawks to celebrate wining the Stanley Cup. However, a miscommunication leads to the crew scrapping the build and starting over from scratch. Meanwhile, Senior rushes his dog to the emergency room.

The OCC crew continues building the Blackhawks bike while Junior meets with representatives from Carolina Carports who want PJD to build a bike for their company. Later, Senior makes an important decision agreeing to meet with a therapist for Mikey.

Senior sees a therapist, but his sons don't think he's making enough of an effort. Meanwhile, work continues on the Carolina Carports build at PJD; and Junior unveils his bike in North Carolina to a crowd of 400,000 people.

Get an inside look at what it takes to produce the American Chopper series through interviews with the Teutuls, producers and crew.

Senior and Junior are both invited to Jason's wedding. Junior gets a build from a longtime OCC client, frustrating Senior. OCC unveils the Hair Club bike in front of a roaring crowd in Washington.

Lee resurfaces, and talks to Senior about his relationships with his sons; Senior files a second lawsuit against PJD; OCC unveils a bike in New York City while PJD unleashes a top-secret bike in Florida.

A bike for St. Jude Hospital is unveiled; foreclosure rumors about OCC spread; an employee may lose his job at PJD.

Tensions are high at PJD as Odie back talks Junior. Junior fires Odie who then turns to Senior for counsel, and hopefully, a job. PJD pulls off a double-unveil for Universal Property Insurance while OCC unveils a bike to an enthusiastic crowd at Bic.

PJD starts a build for Jared Allen's charity while OCC works on a custom build for Supernatural Cymbals. Junior meets with lawyers to stay on top of a new lawsuit from his Dad. Mikey gets a taste of the limelight at his successful art gallery opening.

OCC builds a money-themed bike for longtime client Alan Brownfeld, while Junior and Mikey head to Louisiana to consult on a custom gun design with Will Hayden of Red Jacket Firearms and Sons of Guns. Then Senior announces his reconciliation with estranged son Dan, and Junior and PJD unveil their Jared Allen charity bike to a roaring crowd.

Senior visits Mikey's gallery and is affected by paintings depicting their strained relationship. While both shops work on respective builds, Junior learns he has won his appeal of Senior's lawsuit, and Senior decides to make Junior a settlement offer.

As Senior makes an offer that he claims Junior rejected — and Junior claims Senior took off the table — both parties wonder whether the other really wants to move forward. PJD starts their charity-bike build for CrankyApe, one of two they are building for the company, while at OCC, the crew is underway with a triple bike build for Trans Am Depot. Then, Senior's dog dies and Junior reaches out to his father.

The OCC crew heads up to Alaska to meet up with the Hillstrand brothers from Deadliest Catch. Then the Deadliest Catch Bike is built and unveiled at the CatchCon fan convention in Seattle.

Cadillac enlists both OCC and PJD to build a bike in a father-son build-off. But even as the competition heats up, Senior reaches out to Junior with a second settlement offer ... and this time, without lawyers.

OCC and PJD rush to finish their Cadillac bikes for the build-off, then race CTS-Vs at the Monticello Raceway. And at long last, Junior and Senior face each other when they unveil their bikes at General Motors.

Senior and Junior finally sit down to settle the two-year lawsuit that has torn their family apart. Amidst the drama, PJD starts a new bike for FIST Enterprises while OCC builds a rock-and-roll-inspired bike for Hard Rock.

Junior and Vinnie venture into "enemy territory" to pick up the Black Widow Bike, and Senior express his frustration that he hasn't seen Mikey post-settlement. PJD assembles the FIST Bike while OCC creates the Power Probe Bike.

PJD works on a build for Gears of War 3, while the OCC crew builds a bike for Feather Free Zone. Meanwhile, with the OCC headquarters in foreclosure, Senior considers building a new shop at the front of his property or moving to the old OCC.

OCC starts a build for WyoTech, a school for budding mechanics, while PJD continues work on their Gears of War 3 trike. Then, WyoTech students visit OCC to help out, while the understaffed PJD crew wonders how to find talented mechanics.

Post-settlement, Senior tries to commission a painting from Mikey, but gets mixed signals from his son. OCC starts a build for Beck's, a family-owned hybrid-seed company that wants to build a reverse trike, while PJD works on a modern design for Cepheid, a medical diagnostics company.

In this special episode doors fly from hinges and windows are shattered as cast members recount the most heated moments over the past few years. The most memorable fights between father, sons and coworkers often begin with business but get personal.

Deciding he'd like to commission a painting, Senior continues to reach out to Mikey, who seeks counseling from Vinnie. In Atlanta, PJD reveals the bike for Cepheid, a medical technology company, to an impressed crowd, while in Indianapolis, OCC unveils the all-custom reverse trike for Beck's Hybrids as well as a bike to be used to raise money for the We Care for Orphans charity.

Mikey recalls his favorite American Chopper memories; both good and bad. From PJD's first big bike unveil in Sturgis, South Dakota to bow fishing in Louisiana. He relives the scary encounter between Junior and a lion while on safari in South Africa, as well as some touching family moments.

In celebration of its 100th anniversary, Dekalb commissions a bike from PJD to be auctioned off with the proceeds going to benefit the American Red Cross. Meanwhile, OCC begins a build for Cell Buckle, a company that builds cell-phone holders for vehicles, to be unveiled at Sturgis. But when a dissatisfied Senior decides they must start from scratch, an offended Jason does the unthinkable.

Mikey and Senior both say they want to meet up, but go back and forth about the conditions under which they will meet. Then, OCC works until the last second to complete their bike for US Biker Law.com, while PJD unveils their bike for Dekalb.

Senior and Junior reveal their all-time favorite bikes including OCC's St. Jude bike, PJD's first ever client build for Geico and a shared favorite between father and son.

Junior lands the biggest job of his career when he is asked to build a bike inspired by the restoration of Ground Zero in NYC. Senior secures a build for a wealthy foreigner and rumors fly at both shops over Rick's assumed discontent at OCC.

A three-way build-off is announced and contender Jesse James throws down the gauntlet by sending vulgar cakes to OCC and PJD. OCC works on two bikes and Junior unveils the biggest build of his career at Ground Zero in NYC.

A recap of some of the best pranks include an air-gun at OCC headquarters, scooter jousting and helicopter drops.

In the aftermath Chopper Live, Junior celebrates his win while fulfilling an order for an overseas client, while Senior focuses on the future with a big build and an even bigger opportunity: a spot on Celebrity Apprentice.

Senior deals with the death of his mother and is hurt then he does not hear from Junior or Mikey. Then, while PJD starts a build for One Call Concepts, OCC unveils a gold bike for Donald Trump.

OCC builds a bike for Veterans Airlift Command and PJD finishes a bike for One Call Concepts. After his mother's death, Senior is more determined than ever to reconcile with Mikey and Junior, inviting Mikey to join him at a painting class.

Rick's news? He's ENGAGED! Meanwhile, Junior decides to revamp the Black Widow Bike he recently reclaimed from Senior, and OCC works on a two-bike build for John Christner Trucking.

After weeks of silence, Junior calls Senior to give his condolences on Helen's passing. Then PJD starts a charity build for the March of Dimes while OCC finishes a two-bike build for John Christner Trucking.

Mikey launches a "Fill the Diaper" fundraising campaign for March of Dimes, OCC starts an eco-friendly build for CIMA Green and PJD unveils the March of Dimes bike. Meanwhile, Senior takes bold steps to reunite with his sons.

In this special episode, Junior seeks to take his company in an entirely new direction by making a custom kit for a muscle car that will be unveiled at Daytona Bike Week.

After receiving a puzzling text from Mikey, Senior calls Junior to make amends. PJD starts a build for Newmont Mining while OCC unveils a bike for CIMA Green. Then, Junior asks Senior for a face-to-face meeting, sans cameras.

OCC starts a 1970's themed build for MyPillow while PJD puts the finishing touches on a bike for Newmont Mining. Then, there is promise that all the family drama could finally end as Senior and Junior agree to meet in person.

Junior and Senior ditch the cameras and finally meet face-to-face to discuss their relationship. Meanwhile, at the shops, OCC finishes a bike for MyPillow and PJD starts a build for an MLB outfielder.

OCC starts a build that will be unveiled to the prime minister of Malaysia, while PJD finishes a pimped-out bike for baseball player Aaron Rowand. And Mikey drops an unexpected bomb when he considers quitting the show.

Senior, Jason, Jim and Steve travel to Malaysia, where they not only unveil their latest bike, but also encounter wildlife, swim under waterfalls and barter at the central market.

PJD starts a build for Skil Tools while OCC begins a bike based on an Italian sports car. Then Junior makes a huge decision that could finally end his estrangement from Senior once and for all.

OCC finishes the Italian sports car bike and PJD unveils the Skil Bike. Then, Mikey leaves the show once and for all, and Junior goes to OCC to confront Senior face to face.

Go inside the American Chopper season finale with behind the scenes insights, tweets, and all new bonus footage from the meeting between Jr. and Sr.

Senior proposes that he and Junior combine forces to build a bike for charity, but Junior is unsure how to respond. But when Rick's wedding brings the two together, Junior gets the reassurance he needs to make a decision once and for all.

Senior and Junior brainstorm bike styles for their upcoming collaboration and decide to recreate the first bike they ever built together. Then PJD unveils the Geico Armed Forces tribute bike and OCC reveals the Cafe bike at the opening of the OCC Cafe.

Senior and Junior get to work on their bike build, which reaps surprising results as the two bond over old memories. Meanwhile, PJD starts a trike for Loopster while OCC builds a bike to benefit Senior's favorite charity.

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.

PJD begins a build for QUBX while OCC unveils a bike for Wildgame Innovations; father and son continue their collaboration.

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.

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.

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

Senior and Junior start brainstorming the production bike, but the road is rocky from the start. First, the two bump heads when discussing design workflow. Then, when Junior leaves town, Senior hijacks control of the project.

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

Junior and Senior disagree on the production bike design process.

When hurricane Sandy hits, the PJD crew rushes off to rescue the 9/11 Memorial bike. Progress on the production bike stalls out when Sr. and Jr. disagree on a plan of action. Sr. and Vinnie finally face off about their past differences after five years.

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.

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.

Junior, Senior, Jesse and the Fast N' Loud team compete to build the best bike but trash talk and relentless pranks threaten to knock everyone off course.

Senior, Junior, Jesse James and the Fast N' Loud guys compete in a rematch of the ultimate bike build-off. You voted. Now find out the results in a live throwdown hosted by Sal Masekela at the Hard Rock Hotel in Las Vegas.

We are given a look back at the American Chopper history, from the start until the end of the show.

Senior, Junior and Mikey make a lasting impression by donating the TEUTUL Bike. Senior pulls one last prank and the threesome takes a raucous ride through the most dramatic and defining moments of American Chopper.

This is the final episode of the series. Mike Teutal appears in this episode and reunites with his father.