Cormac loves to be busy, but with a problem at the docks, he gets increasingly bored, but when Jackman, Asher and Calley are trapped behind a rockfall at the quarry, it's Cormac to the rescue. Cormac tried to lift the large pieces of rock, but they're too heavy, then he saw a big excavator, he used the excavator to smash the pieces of rock to save the Chug Patrollers and save the day.
Jackman, Asher, Puffer Pete, Olwin and Koko have to struggle down an icy slope to get to the inaccessible frozen over docks to get fuel for all the chuggers when an ice storm hits Chuggington and fuel supplies run low.