Koko becomes stranded during a power cut; Wilson tests out his animal transportation device; and Koko cannot resist exploring an underground tunnel despite being told not to.
Koko and Zephie paint one another's faces with ugly designs as a joke; a power cut causes Frostini's ice-cream to melt; and Hoot and Toot find Brewster's teaching boring and run away.
Honking horns! Chuggington is a special place where train engines have come to life. Ride along on the humorous adventures of Koko, Wilson and Brewster, three young trainees learning to ride the rails of life to become full-fledged chuggers!
Wilson rescues Koko from a collapsing mine; Emery needs help after breaking down in the forest; and Buster decides he has a talent for track-laying.