This cartoon series was made in france and appeared on Nickelodion in 1986.

Ever since the time of the Great Cataclysm, the Arkadians have lived deep in the center of the earth. They believed they were the only survivors of this great devastation. Their civilization thrived under the power of their sun, the Tehra... until it began to fail. In desperation, the children of Arkadia broke the law and entered the forbidden Archives searching for a solution. What they discovered gave them hope. Anxiously, they used their special powers and created a messenger to the people above. They named her Arkana...

Arkana was joined by Matt and Rebecca--two children from the surface world, Bic and Bac--a pair of Arkadian anteaters, and Spartakus--a mysterious wanderer. Aboard their living ship, Tehrig, they journeyed through the strata--sunken worlds that lie below the surface of the earth--uncovering the long-forgotten secrets of Arkadia's past.

This is Spartakus. Spartakus wears a wristguard that was passed down to him by his father. It is capable of firing deadly crossbow bolts and a grappling hook, and has a concealed blade. Spartakus does not know where it originally came from, but suspects it may have some connection to the ancient Arkadians.

Arkana is a magical being created by the children of Arkadia and brought to life by the power of the Tehra.

Rebecca and her brother Matt are two children from the surface world. The brother and sister helped Spartakus rescue Arkana and Tehrig from the Pirates, and soon became caught up in their journey back to Arkadia.

Bic and Bac are two of the oldest creatures in Arkadia. They left Arkadia with Arkana and Tehrig, hoping to meet the people from above. Bac is the one with the long ears, and Bic is the one with the short, round ears.

Tehrig is an ancient living flying machine from the days before the Great Cataclysm. He lived in the Archives of Arkadia (which he refers to as "his" Archives) and was the only being allowed to enter them freely.