SpongeBlob was made by Patrick Star in the episode "It Came from Goo Lagoon." He was made of Super Goo, a highly toxic substance that was contained in purple goo. Patrick had made him when he got bored and was waiting to get rescued. When he was rescued, he was not adamant about leaving SpongeBlob.
SpongeBlob, similar to Pillow SpongeBob and Krabby Patty, Patrick just drew on face and formation of SpongeBob to the Super Goo.
"We paid ten dollars for this?"
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