The Shelly Superhighway just appears in the episode: SpongeBob's Last Stand. The Shelly Superhighway goes through Jellyfish Fields and over the Chum bucket. In the episode, it is revealed that Plankton wanted to build the superhighway to make SpongeBob spill the beans of the Krabby Patty Formula. After many Jellyfish overflow Bikini Bottom, the town gets rid of the highway.
The second part of the plan
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