American Chopper Season 4

When Orange County Chopper breaks ground on their new shop, Paul Sr. challenges Paul Jr. to a design contest.

The design contest between father and son continues, with fans picking the winner. Paul Sr. goes old school while Jr. puts together a new spider-web design.

OCC designs and builds a high-tech chopper for GoDaddy.com, but Jason and Paul Jr. can't agree on a design, so Senior has to step in.

As work continues on the chopper for GoDaddy.com, Mikey and Paul Sr. take a trip to the racetrack, where Mikey gets to show off his racing skills to Danica Patrick.

Mikey and Vinnie embark on a quest to obtain New England lobsters for the guys at the shop.

While Orange County Chopper begins work on a custom bike for the Flow International Corporation, Mikey starts on a secret project of his own.

OCC continues work on the chopper for the Flow International Corporation. Meanwhile, the crew goes to a paintball course to let off a little steam, OCC-style.

OCC boots up their latest custom chopper--a computer-themed creation for the HP Corporation. With the build underway, the OCC crew makes a call to the tattoo artists of Miami Ink to discuss getting some new tattoos.

OCC continues on their computer themed chopper for the HP Corporation. Meanwhile, Ami and Chris from Miami Ink continue their custom body art on Senior and Beth. The guys encounter problems at the bike's reveal and Senior narrowly avoids a mishap.

OCC amps it up as they start on their latest custom creation--a guitar-themed chopper for Peavey Electronics. But when Senior brings in a second build, for the Go Fast Energy Drink company, the work piles up and the company's resources are spread thin.

OCC continues on their custom chopper for Peavey Electronics. The double build winds down as the guys travel to Las Vegas to unveil the Go Fast bike, and then on to Anaheim for the Peavey reveal.

It's another OCC family vacation as the Teutuls go walkabout in the 'land down under' where Russell Crowe asks the guys to build an Australia-themed chopper.

The Teutuls continue their adventures in the Great South Land. After arriving at Uluru, the guys find themselves immersed in Aboriginal culture.

Final part of 3 part series. The Teutel's take a two week trip to Australia and create a down-under themed bike.

The guys start work on a high-tech bike for Intel featuring the latest in motorcycle and computing gadgetry.

The guys finish off work on a high-tech bike for Intel featuring the latest in motorcycle and computing gadgetry.

OCC hits the links for their latest project: three EDS sponsored choppers honoring the career and charitable work of golf legend Byron Nelson.

OCC hits the links for their latest project: three EDS sponsored choppers honoring the career and charitable work of golf legend Byron Nelson.

OCC hovers over their next project--a sleek, custom creation for Silver State Helicopters. But aspects of the bike's design present new challenges for the crew, and forces Paul Jr. to confront creative obstacles of his own.