Incidental 73 is a fish that makes several cameo appearances throughout the series.
He first appears in the episode "Pickles," where he is debuted in a brief cameo along with other fish worried about Bubble Bass.
He is a light green and light blue fish. He wears a purple shirt with a white coat and gray pants. He has four different sized dark blue spots on his head.
In "Pickles," he sees that SpongeBob is back after being on leave due to not being able to make a Krabby Patty and runs into the Krusty Krab. He later glares Bubble Bass after he is caught in several lies.