Christopher Ralph played the role of Tobias in a 1998 series based on a book series by what author?
Christopher Ralph:  He is perhaps best known for his role as Tobias in the 1998 TV series "Animorphs". Animorphs (TV series): Animorphs (also known under the promotional title AniTV) is a television adaptation made by Protocol Entertainment of the Scholastic book series of the same name by K. A. Applegate.
K. A. Applegate