Charles Grosvenor Director, Producer Thomas Dekker Littlefoot Voice Anndi McAfee Cera Voice Aria Noelle Curzon Ducky Voice Jeff Bennett Petrie Voice Rob Paulsen Spike , Rinkus Voice Michael York Pterano Voice Jim Cummings Sierra Voice Kenneth Mars Grandpa Longneck Voice Miriam Flynn Grandma Longneck Voice Len Uhley Screenwriter Michael Tavera Original Music Danik Thomas Film Editing Susan Blu Casting