The 405 returns to their roots as they build and race monster small-tire cars; when local racers, the McKees, challenge them to their first showdown, the crew must quickly get their new cars dialed in to prove they can dominate on any tire.

Higgins enlists Watts help after he messes up the courier delivery of a horse statue for some very dangerous thugs.

Longtime best friends, Tara and Jessica, want to rule their 30th High School Reunion, but their plans go sideways when everyone is forced to tell the truth. Andi wants to know if her cat BoBo loves her as much as she loves him. Roarke juggles a secret romance, as Ruby and Gina spend more time together.

Ben lands in 1979 Chicago as Jack Armstrong, a devoted security guard to talented pop singer Carly Farmer. During Carly's prep for a concert, it quickly becomes clear her life is in danger and Ben must determine who is trying to kill her and why.

Mehmed prepares to strike a fatal blow to Vlad's army. A spy is found in Mehmed's camp. Vlad launches a nighttime attack, but a surprise awaits.

Daniel doesn't want his Aunt Diane to know who he's dating because he fears what she may do. Diane tries dating a nice guy, for once.

Already on edge over the past resurfacing, Yeon-jin grows more anxious when she learns about her daughter's new homeroom teacher - and of a sudden death.

A sobering diagnosis pushes Leo to break out of prison with help from a cellmate. After an emotional reunion on the outside, Leo begins plotting revenge.

Cleo turns to Miranda for help, but a bunch of different problems start popping up. Diana tells Fernando the truth about Luísa.

Raúl tries to adjust to his new situation. Pedro tries to sign up for unemployment, and makes a big mistake. Luis and Santi look for a gay friend.

Rumours spread around Ashford, and suspicion lands on Joe, Isabel's father; as Cormack interviews the time capsule kids, more secrets emerge.

It's a new term for William Beswick High, but with pupils rioting, head Kim Campbell is forced into drastic changes. A fugitive found hiding in the school gives everyone a shock.

Nikki becomes even more involved with the Ndrangheta mafia-group and Jack uncovers some disturbing leads. An unlikely alliance leads Nikki closer to the truth, but not without some collateral damage.