A deadly trio emerges, hell-bent on unleashing a new era at Camp Redwood. Our former counselors desperately try to keep history from repeating itself.

Severide must make a tough decision about the future of his career at Firehouse 51. Herrmann deals with the consequences of his temper. Cruz is excited to demonstrate the Slamigan at the Firefighting Expo. Commissioner Grissom returns.

As a record-breaking heat wave overtakes Philly, the Gang plans to profit from global warming by pumping up the A/C so people will congregate at Paddy’s and save energy at home.

Gloria is using her alone time with the twins as an opportunity to secretly baptize them before Haley and Dylan get home. Claire is still dealing with the fallout from the smart closet fiasco. Cam is at war with his school’s mascot who is threatening his chance at securing a new college coaching job.

The Mayor has evidence that Randy blew up his neighbor’s yards in protest over homegrown weed and then blamed it on a Mexican Joker. Now the citizens of South Park have had enough of Randy and Tegridy Farms and they just want to lock him up.

Jimmy welcomes actor Henry Golding, actress Noomi Rapace, and magician Dan White.