Mack is a brand new firetruck who wants nothing more than to do a good job for Chief Fred. Ladder and Hoser, his buddies at the fire station, are so much bigger and more confident than Mack. Small and shy, how will he ever be good enough? When the alarm sounds an emergency, Mack and the other larger firetrucks follow Chief Fred to the disaster. Mack watches Ladder and Hoser perform like heroes, until Chief Fred needs him - and his special talent - to finish the job. Mack learns the value of being himself, even if it means being a different kind of team member.