Calling all heroes! Spencer shows his mettle when he steams through thick fog to rescue Percy. Toby's new whistle rings friends and animals to safety. Bob the Builder's Machine Team helps Scratch out of a sticky situation. Dizzy surprises her friends, and herself, when she turns a big mistake into a great success. Fireman Sam proves that a hero's work is never done. James learns that some rescues are best left to the professionals. Everyone is racing to the rescue in this exciting collection!