Stampede! is the thirteenth episode of Chuggington: Meet Thomas, Trainees!'s eighth season.
Thomas, Brewster, Wilson, Koko, Hodge, Dunbar, Calley and Mosquito the Caboose are called to Platform 1 by Vee (Thomas calls her "Zee"). She tells the engines to make a trip to the mountains to collect some coal. However, she dosen't tell them that a stampede is happening.
At the mountains, on the way back, the engines hear rumbling. Mosquito tells them it's a wildebeest stampede, and they should take cover. They find a spare track and go on there. However, it's covered with some rocks, and they can only get in or out through the gate (called the Red Gate, since it's colored blood red).
As Dunbar, Calley, Mosquito, Koko and Wilson park, Thomas, with Brewster and Hodge watch the stampede go by. Soon, they see something. However, the thing turns out to be Mufasa (from The Lion King) climbing. As Scar throws him off into the stampede, Thomas, Brewster and Hodge scream.
As the stampede ends, they leave the 'barrier" (the spare track they were hiding on). As they speed their way down, they manage to see the rest of the stampede. They tell a spare Vee unit that the stampede's still happening. Vee takes this message and reports all the trains of Chuggington to take cover in their sheds because of a stampede.
After it's over, Vee tells them to come out. The episode ends with Thomas, Brewster and Hodge getting their "Survive a Stampede" badges.