In an episode titled Cephalopod Lodge, SpongeBob SquarePants and his starfish buddy (Patrick Star) infiltrate a Masonic-like Lodge called the Cephalopod Lodge. The Lodge building itself is shaped like a pyramid. The capstone opens to eject any Cowan infiltrators.
In the episode titled Toy Store of Doom, SpongeBob and his friend (a chronically lethargic starfish named Patrick) fulfill their dream of having a toy store all to themselves. To accomplish this, the pair decide to hide and until after closing time.
Their isn’t much to see Illuminati symbol-wise, except an eye-on-pyramid toy on the store’s shelves.