Plankton never rest until he knows the secret recipe krabsburgerov! The only way to know the secret ingredient – Keep the sponge Bob. Plankton sure that he had only to appear at the right time, so SpongeBob will give out all the secrets. To thwart the evil designs, hit the alarm as soon as you see the plankton!
Source
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SpongeBob SquarePants: Formula Hunt screenshots
