Lee Tockar as the voice of Yakkity Yak Brian Drummond as the voice of Keo Pam Hyatt as the voice of Granny Yak Andrea Libman as the voice of Lemony Ian James Corlett as the voice of Mr. Highpants / Rondo Jr. Michael Daingerfield as the voice of Keo's Dad Jason Schombing as the voice of Mr. Trilobyte Scott McNeil as the voice of Professor Crazyhair Tabitha St. Germain as the voice of Penelope Brenda Crichlow as the voice of Wanda