After Thomas and Percy get spooked by a suspicious rumbling, the engines set off to figure out the secrets of the old mine inside Lookout Mountain.
Aaron Barashi
Thomas
Jessica Carroll
Darcy
Henri Charles
Percy
Matt Coles
Whiff
Neil Crone
Gordon (US)
Glee Dango
Sandy (US)
Holly Dixon
Sandy (UK)
Bruce Dow
Sir Topham Hatt (US)
