Episode 4 begins with young Logan teaching young Christian how to drive, after which Logan takes Christian to the junkyard to pick up the UNB10 car.

In the episode, Curtis tries to ask Cate to hang out after auto shop class, but Cate turns him down. Later, Kiara invites Cate to join her for lunch, which becomes a group event.

Noah shows Harris a video online where Harris is mocked for his shredding skills, which prompts Harris to participate in a street race. Meanwhile, Curtis and Zac skip class and head to Pittsburgh, where they get involved in drag racing at an airstrip run by Curtis' brother, Ray.

The junkyard is where Logan takes Christian to pick up the UNB10 car, and in the present timeline, Logan joins the group as they brainstorm rebuilding the UNB10, highlighting its importance to the characters and the plot.

Sam explores Ironwood and runs into Darren at the skate house. Darren mistakenly thinks he and Sam had a first date at the rink, leading them to take a walk around town reminiscing about the past and the changes in the town.