Air date: August 1st, 2004
Whilst delivering trucks to the quarry, Percy whistles a greeting to 'Arry and Bert, who laugh at Percy's whistle. Percy is determined to show the diesels that his whistle is just as good as their horns. As Percy puffs through the countryside, he practices whistling loudly. Later, he goes back to the quarry and creeps up behind 'Arry and Bert, blowing a great toot on his whistle, which startles the two diesels.
Now that he has a super-loud whistle, Percy cannot wait to use it again. So, when he sees Thomas in a siding, Percy blows a loud whistle again! Thomas jumps forwards and biffs into his trucks. Thomas is cross, but Percy is too busy having fun to notice. Later, when he sees Bertie, Percy lets off another loud whistle which sends a startled Bertie swerving across the road and into a snowy ditch. Bertie too is cross, but Percy doesn't realise.
That evening, Thomas tells Percy about all the trouble he had caused that day. Percy was sorry for his actions but, the next day, Percy is steaming through the countryside wishing that he could have one last loud toot on his whistle. So, he looks around for other engines. He can't see anyone about, but what he doesn't know is that Trevor was delivering food to feed the stranded animals on the hill above. Percy’s loud whistle startles Trevor and he jolts backward and knocks a log down the hill. The log collects snow and turns into a giant snowball! When it reaches the bottom of the hill, the gigantic snowball collides with Percy.
Soon, the Fat Controller arrives onboard Thomas, and is angry, scolding Percy for causing trouble. Percy promises to only use his whistle when the time is right. The next day, Percy is a very quiet engine, but as he comes out of the tunnel, he spies a snowdrift on the line. Then, he hears Thomas approaching. Percy blows a warning whistle and Thomas grinds to a halt just in time! Percy is praised by the Fat Controller and now only uses his whistle responsibly.
Tropes featured in the episode:
- Bully Hunter: To prove to 'Arry and Bert that his whistle is just as good as their horns, Percy gives them a scare by whistling loudly at them.
- Cold Turkeys Are Everywhere: Despite being called out by Thomas, Percy can't resist using his whistle again, and he does, but that leads to a giant snowball colliding with him. After the Fat Controller calls him out on it, Percy promises not to use his whistle irresponsibly again for real this time.
- Comes Great Responsibility: Percy learns that he should only use his whistle when it is needed, and not just to play tricks on others.
- Dude, Not Funny!: Thomas and Bertie aren't amused by Percy when he surprises them with his whistle.
- Never Trust a Title: This episode is entitled "Percy's New Whistle" despite the fact Percy never gets a new whistle. He does find a new way to use it, however.
- What the Hell, Hero?: Percy is called out by Thomas, Bertie, and the Fat Controller for whistling too much.
