Bronwyn takes Sarah and Nipper the dog out on a walk along the cliffs to tire out Nipper, but trouble strikes when Sarah falls on a rock and hurts her leg. However, thanks to Fireman Cridlington's new song they remember that red is a sign for danger.

Helen Flood and Firefighter Penny Morris go on a mountain hike while Fireman Criddington tries to teach Radar the Rescue Dog how to roll over. When the fog rolls in and Firefighter Penny Morris hurts her ankle and she and Helen Flood become lost. Fireman Sam, Radar the Rescue Dog and Tom Thomas come to the rescue.