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


Rex is a greenish turquoise worm with yellow eyes and wears a black collar. Rex makes few noises, but he pants and barks once or twice.

Role in series


Rex ironically leaves on the bus after SpongeBob praises worms' loyalty. Rex was only bought in an attempt to make Gary jealous and realize that he should go back to SpongeBob. The only trick he can do is "stay." He did not stay for long, considering the fact that almost immediately after that he went to the bus stop. Then Spongebob gets another new pet and says "Who needs worms anyway?". It is unknown where Rex went afterwards.

Meow...Like a Snail?!

He is seen in the "Dumped" segment of the book.


  • Rex is similar to Jan the 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."
  • Rex resembles an underwater version of a dog as the sea snails represent underwater versions of cats. For example, when SpongeBob expects Rex to do tricks, he barks and pants with his tongue out.
  • Rex almost immediately ditches SpongeBob after about 25 seconds of being with him.
Worms (VE)

Alaskan Bull WormBaby wormsBlackJack's guard wormClown wormEarwormFrench Poodle WormGuard wormJanJKK-9 UnitKenneyMaxMipsey and PipseyMr. DoodlesMrs. SquigglesMrs. WormsleyNematodesPeanut wormsPricklesPrimitive tapewormRexSiana the WormSnookiemsSpotted Glistening Meadow WormTapeyUnnamed wormWorm from AppleworldWormy