The final four drivers tackle some of the toughest challenges they've seen in rehab to date.It all begins as the remaining drivers get behind the wheel of a powerful 4x4 and attempt to complete an Off Road Challenge. With last episode's result being so poor, we revisit the "know where your wheels are challenge". The twist - our final four must complete The Trough in reverse.Finally, our final four learn the skills needed for a high speed Swerve and Avoid. The results are disastrous. It's an explosive episode you don't want to miss.At the end of this episode, one lucky driver graduates avoiding the title and our experts narrow the field to the 3 finalists in the search for Canada's Worst Driver.