Demon Shark (The Scooby-Doo Show)

Demon Shark is the nickname given to an extinct humanoid shark species discovered in the Indian Ocean, where a specimen remained frozen in a block of ice for the last million years.

Biology
Its appearance is similar to a robust man-sized shark with dark blue coloration on its body and lighter coloration on its underside and face. Its eyes are round and yellow. It possesses a dorsal fin on its back and what appears to be a second dorsal fin at the end of its body, in place of the (curiously absent) tail. Most notably, however, it also possesses four well-developed limbs, which look like short arms and legs. The hands and the feet are webbed, with the hands having three fingers and the feet having two toes. Its sharp teeth suggest it led a predatory lifestyle, similar to modern sharks.