It is a bronze-brown penny with a fish on it. SpongeBob says that Penny can sing. According to Patrick, he has the most beautiful singing voice. He does not talk, but he gasps in "Imitation Krabs."
Role in series
"I Had an Accident"
Penny becomes one of SpongeBob's best friends after the latter decides to stay indoors for the rest of his life. Patrick and Sandy try their hardest to get SpongeBob back outside, but he does not leave until Patrick and Sandy get harmed by a gorilla.