The Sewer Snake is a giant snake who lives in the sewers of Bikini Bottom. It only appears in the episode "The Sewers of Bikini Bottom."
It is a large, dark green and light green colored snake with red eyes and big fang-like teeth. It has been shown to eat what would be indigestible objects to humans.
It appears to be hostile towards individuals who enter the sewers it dwells in, as demonstrated with SpongeBob and Squidward in the sewers.
The snake is first seen in the sewers where it pops out of the water and lifts the safe, containing the Krabby Patty Secret Formula, with its nose. The snake then acts aggressive towards SpongeBob and Squidward and chases them through the sewers where it eventually ears them. However, by tickling the inside of its stomach, SpongeBob and Squidward successfully make the Sewer Snake vomit both of them out of its mouth. It later appears in the Krusty Krab Stadium where Charlton Hawkfish uses his sharp nose to pop it like a balloon which sends it flying back to the sewers.