Sergeant Sam Roderick is a strict and authoritarian shark (judging by his appearance, likely a goblin shark) who appears in "Mrs. Puff, You're Fired." He replaced Mrs. Puff after she got fired. This episode was his only appearance. He is a very respected man and a great military sergeant. While teaching SpongeBob, his technique of making SpongeBob complete the course blind-folded allows him to drive perfectly. When his test for a license starts, Sam doesn't allow SpongeBob to wear a blindfold,making him rampage across the city driving. He gets blindfolded by Patrick's pants and makes the parallel park. Towards the end of the episode, Sergeant Roderick must sacrifice his body in an unsuccessful attempt to stop the boat, saying that he wants Gunther to tell his wife that he loved her. He was hit by the boat and his fate remains unknown. His name was never said in the episode.
Even though Sam is a Sergeant, his shoulder device shows he is a Corporal.