Prickle is the series' tritagonist and is a yellow triangular dinosaur, possibly a Plateosaurus, with sharp white spines. He speaks with a Midwestern accent. He is one of Gumby's friends and is voiced by Tony Grant. Although a secondary or tertiary character in many shorts, some of the shorts have featured Prickle as the leading character. He is also made an enemy in a mad professor, not out of spite, but the fact he is a living dinosaur. The evil professor attempts to capture Prickle in an attempt to achieve fame.