Barry White and the Speed Shop team are exhausted. The challenge of transforming a rusted wreck into a gleaming, powerful, super muscle car is enormous in itself. But every month, for the last 9 months, they've done exactly that. Now, there is just one car left to build.

For the grand finale, Barry is looking to create something truly unique and buried away at the back of a scrap yard, he finds it. The Dodge Dart.

Stock standard, this was not a vehicle to get an enthusiast's heart racing. It was a compact, with good but not outstanding performance. That was until someone got the idea of dropping in a massively powerful Hemi engine, and creating the fastest accelerating car on the road.

Barry plans to recapture the spirit of that '69 legend, by building his own Hemi Dart. After completing nine previous cars on time, he's confident he can do it. Maybe too confident. Before he's even bought the wreck, Barry's committed to sell the Dart at the Russo and Steele auction, in Scottsdale Arizona, at any price. He has to get the car there, and unless it's perfect, he'll lose a fortune.

Designer Chris Brown has a plan to bump up the price, by injecting a little Rock and Roll into the Dart. He's got a contact with the 1980s band Poison. It's a perfect fit. The "Poison Dart". But can he convince drummer Ricky Rocket to come down the Speed Shop and give the car his blessing?

4 weeks. An implausibly powerful car. A rock star to wrangle. Selling at any price. Can Barry White pull off perhaps the biggest challenge he's faced in the series?

If the Dart misses the target, it will end up costing Barry a fortune.