Gran announces it's time for a Thunder Sister retreat at Camp Thunder to strengthen their team building skills, but Gran takes it too far when she puts the sisters through a dangerous trial.
Guest Cast
Dee Bradley Baker
voices Sandy
Hannah Parrott
voices VocalistCast Appearances
Kiff VandenHeuvel
voices Grug
Amy Landecker
voices Ugga
Ally Dixon
voices Eep
A.J. LoCascio
voices Thunk
Artemis Pebdani
voices Gran
Darin Brooks
voices Guy
Matthew Waterson
voices Phil
Amy Rosoff
voices Hope
Abby Trott
voices DawnEpisode Discussion
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