As Norman and Mike compete to promote their separate shows, Mike's electric billboard is suddenly on fire and rolling downhill towards a fuel truck down at the quay.
A sea turtle has been spotted off the coast of Pontypandy and everyone is doing their part to clean up the ocean. When Joe and Hannah's submarine loses power, Sam and the team are called in. Will they find the turtle?
Its Dinosaur Adventure Day, but when Norman scares Derek with a "real live dino" on Pontypandy Island, Derek ends up stranded on a cliff ledge. Sam and the team abandon their water cannon drills to save the day.
Malcolm is joining the Wild Men of Pontypandy for a cookout. But when Nipper steals Malcolm's BBQ chicken and they try to get it back, the BBQ is knocked down the hill and into the train station.
It's been a hot summer and Sam and the team are on high alert. Malcolm goes on a hike with Mike, Helen, Mandy and Norman. But when a forest fire starts, Malcolm must keep them all safe until Sam and the team can find them.
When James becomes Malcolm's deputy for the day, they end up with a real case to solve. But when James tries to arrest the culprit, which turns out to be a horse, he ends up on her back and racing through Pontypandy.
When Sarah tries to turn Trevor into a ukulele rock star, the filming of his first video goes wrong and he ends up heading for the waterfall's edge. Sam and the team manage to save the day and end up the surprise stars.