Mattress is a character that only appeared in the episode, "Extreme Spots."
He is a big light blue bed with white eyes.
I can turn into a skyscraper!
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Role in the episode
In the episode, "Extreme Spots," when Johnny Krill is showing SpongeBob how to fight, he beats up a pillow, named Charlie. And then the mattress saw him and he avenges Charlie and then beats up Johnny Krill.