Twilight and Spike are sent by Celestia to the ruins of her old castle for research, and unknown to each other, the rest of the ponies find their way there as well. Meanwhile, trap doors, secret passages and a dark presence known only as the Shadow Pony await them.
Elenco: Tara Strong , Andrea Libman , Ashleigh Ball , Tabitha St. Germain , Cathy Weseluck , Michelle Creber , Claire Corlett , Madeleine Peters , Nicole Oliver , Peter New , Brenda Crichlow , Chantal Strand , Shannon Chan-Kent , Brian Drummond , Rebecca Shoichet , Kazumi Evans .