Heathcliff and the Catillac Cats - Season 1 - Eps 102: Journey to the Center of the Earth
When Cleo's interest is aroused in the subject of Archaeology, the Catillac Cats decide to set out on an archaeologist expedition of their own. They travel through catacombs on a prehistoric adventure that offers Saber-toothed tigers, dinosaurs, and even Cleo and Riff Raff's cavecat ancestors!
About Heathcliff and the Catillac Cats

Title: Heathcliff and the Catillac Cats
First Air Date: 1984-09-17
Last Air Date: 1985-10-07
Status: Ended
Rating: 6.3/10 (from 48 votes)
Language: EN
Seasons: 2
Total Episodes: 172
Network: France 3 FR3
Genres: Animation, Comedy, Kids
Production Companies: ICC TV Productions, DIC, DiC Entertainment, McNaught Syndicate, Chris-Craft Television, United Entertainment Group, LBS Properties
Synopsis
Heathcliff knows he is the best cat around! Never have we seen such self-confidence topped off with a heavy dose of vanity, cunning, ruthlessness, and a mischievous love of gags. He cruises and struts down the street and watch out any person, cat, or dog who gets in his way! Although he may terrorize the neighborhood, let an outsider try to push anyone around and he is a veritable tiger of defense. On the other side of town are The Catillac Cats, which typically revolve around leader Riff-Raff's get-rich-quick schemes or searches for food.
Cast

Mel Blanc
Heathcliff (voice)

Donna Christie
Cleo / Iggy (voice)

Peter Cullen
Pop / Max (voice)

Jeannie Elias
Jeannie Elias (voice)

Danny Mann
Hector (voice)

Marilyn Lightstone
Sonja (voice)