As with previous years, eight people, nominated by their family or friends, enter the Driver Rehabilitation Centre to improve their driving skills.
Two experts return from Canada's Worst Driver 2, though Marcus Agyeman and Juliana Chiovitti, insurance broker and performance driving instructor, respectively, from the past season, are not among them.
Thomas makes the right choice, but instead of leaving in his car (as is the norm for all graduates), he is taken back to the Barrie Speedway, where he partakes (and wins) in his first race on a track.
At the start of the episode, Andrew reiterates that the driver rehabilitation program has had a number of success stories-- Manuel Tejeda (from the previous season) has not hit a thing since leaving rehab (amounting to over two years and 15,000 km (9,300 mi) of driving), while Jodi Slobodesky (from the previous season) is now in a job where driving well is paramount—selling cosmetics door-to-door.
Cam and Andrew choosing Jennifer—leaving Phillippe with the deciding vote, in which he immediately decides that Ed, whose relationship with Elizabeth has gradually improved over the course of the season, should be the next graduate, not only ensuring that there will not be three men in the finale, but also sending Jennifer into the finale with Jason and Shelby, with Ed also admitting that he was not as good of a driver as he thought when he arrived and that alone has helped the couple reconcile.
Because Adrian left the Rehabilitation Centre to make it to his sister's wedding after the Mega-Challenge, Jason gets a ride home from Shelby in the Cool Bus.
It is also noted by Andrew that now that Jason has retired from driving, that technically makes Shelby, who therefore fails to graduate, "Canada's Worst Driver."