Challenge to build a vehicle that can jump crushed cars, race down a dirt straight away, but can still be agile enough to handle tight turns. Contestants Team Blue The Law Dawgs Team captain Tom Dave Mike, Expert John Seasock Team Orange Ghost Mountain Riders Team captain Scotty Clark Johnson, Expert Roy Hooser

The Challenge is to build a vehicle that not only must carry all members to a gap, but then span the gap without leaving any parts behind, retrieve a flag, and go back to where they started in a head-to-head race.

Challenge to build the most accurate and destructive cannon. The objective to break the most concrete bricks in the opponent's wall. They both get three shots both teams thinking the 1st being pretty much a throw away shot to sight in the sights Contestants Team Green The Hicks Family Team captain Sam Anna Jakey Expert Bruce Paulson Team Yellow Washburn Boys Team captain Ray Shane Jon Expert Bernie Paulson

Challenge for each team to build a raft that can carry two team members out of scrap. Then race the rafts up and down a white water course trying to avoiding rocks and not capsize. The team that completes the course in fastest time wins and advances to the next round. They have 3 laps to get the fastest time. Contestants Team Red The Dukes of Spook Team captain Dave Smith Laura Frenchy Expert Chuck Ratley Team Blue Nasa's Rocket Men Team captain Mike Jim Tom Expert Doug Riddle

Challenge to build a glider that can stay aloft for the longest time. The course is a large hill. One team goes for a traditional design the other goes more radical. Contestants Team Red Miami Gearheads Team captain Milton Frank Anthony Expert Chuck Slusarczyk Team Green The Hicks Family Team captain Sam Jakey Anne Expert Barnaby Wainfan

Challenge to build to a torpedo that can maneuver around obstacles in the water to reach the enemy ship and hit a target to register a kill. The best of five head-to-head rounds wins. Contestants Team Dark Blue Nasa's Rocketmen Team captain Mike, Tom, Jim, Expert Joe Curren Team Light Blue The Law Dawgs Team captain Tom, Mike, Dave, Expert Greg Bryant

Challenge: Each team has to build the most powerful demolition machine they can. Then, they'll try to destroy 9 panels of wall built from concrete blocks. The team that completely destroys the panels in less time wins.

In the first of the Junkyard Mega-Wars special, 3 teams of builders from United States, Great Britain and Russia build a vehicles capable of race across salt flats, drive over a rock-filled canyon floor, and sail over a freshwater lake. Instead of 10 hours of build time, each team has 20 hours to spend, with 10 hours per day.

Team - Members American Raptors (USA) - Joe Ruggles, Barry McGarraugh, Matt Swain, Jason ""Pudge"" Bunch - Expert British Bulldogs (UK) - Lee, Tim, Mike - Captain, Graham Mitchell - Expert Russian Bears (Russia) - Rene Pohl - Expert

Judge: Tony Shaw, HumVee expert and mechanical engineer, from U.S. Army's TACOM (Heavy Automotive Division).