Mutant Whelks

Mutant Whelks is the 3rd episode of Misadventures of SpongeBob

Plot
A newsflash appears talking about unidentified mollusks eating crops, a newspaper spins up to the screen about the whelks, then a radio says "Protect your crops, strange whelks have eaten all of the crops in Old Man Jenkins Farm, after hearing this, SpongeBob and Patrick decide to investigate. They go to Jellyfish Fields and find a huge trail of slime, but it is from a Large Snail and not a Whelk. But then they find a huge whelk.