There's trouble for Trevor Evans as the school bus swerves off the road and breaks down in the Pontypandy hills. Unfortunately, mobile phones have no signal up in the Welsh hills and he is stranded - with a beast about. Fireman Sam comes to the rescue, with the assistance of Tom in the helicopter. Then they search for Trevor, who made an attempt of finding help. In the end everyone is safe and they go home. Norman spots a black animal passing over the road just before the bus rounds a corner, but when he tells everyone else about his sighting, nobody believes him.

As preparations are made for a Pontypandy Karaoke night, Sam and the other firefighters prepare for a drill. Mike Flood works on repairs for Bronwyn but he gets trapped in the Jones' basement, after he accidentally jams the door and causing a small leak to turn into a flood. Fireman Sam comes to the rescue.