크레딧 출연 Joel Breed Professor Jackson Greta Kernkamp Elizabeth Kelan Smith George Christopher Sturz Jonathan Mike Cook Gustav/Gruff/Spooky Tree Mandy Tietz Stephanie Yates Cassie Pearson Penny Hannah Monterey Jones Amy Seth Berrier Michael Kaiser/Lobo/The Monster Greg Kernkamp Sven/Toady/Spooky Tree 스텝 Adam Boll Sound Mike Cook Directing Christopher R. Mihm Writing