Rex

Rex is a pet worm that takes in after  left him in the episode "Dumped."

Description
Rex is a large turquoise worm with yellow eyes. He wears a black collar. Rex pants and barks like a dog, like all worms in the series.

"Dumped"
Rex was only bought in an attempt to make Gary jealous and realize that he should return to his former master. Rex ironically leaves on the bus after SpongeBob praises his loyalty. The only trick he can do is "stay." However, he did not stay for long, considering the fact that he left for the bus stop the exact moment SpongeBob turned his back on him to taunt Gary about how a worm would be "always by my[his] side!" It is unknown where Rex went afterward, but SpongeBob truly doesn't even care as he gets another new pet and says to himself: "Who needs worms anyway?".

"The Clam Whisperer"
Rex, Mystery the Seahorse, and Larry the Snail are seen drinking out of a river with straws. SpongeBob and the clams he was following scare them away.

Trivia

 * Rex is similar to the purple worm and Mr. Doodles, but he has a color shade of light teal.
 * Similar worms have appeared in other episodes, most recently in "Plankton's Pet."
 * The asset discs for SuperSponge contain two model sheets for Mr. Doodles that are mislabeled as "Rex the Worm."

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