Kelpshake was a drink-shaped restaurant chain that appeared in the episode Best Frenemies.
Kelpshake was owned by Barnacle Products Incorporated. It was created as a business to ruin the Krusty Krab and the Chum Bucket. These restaurants sell Kelp Shakes, a popular soft drink comprised of kelp juice. Their stores also serve pastries and baked goods.
The restaurant chain attempted to expand their business into Bikini Bottom, where (literally) hundreds of these restaurants eventually came into business by multiplying (the stores split in two like amoebas). The Kelp Shakes eventually became so popular that nobody wanted to drink anything else from other restaurants and the Krusty Krab initially lost all of its customers when Mr. Krabs announced a 'no outside drinks' policy.
When Mr. Krabs and Plankton saw that these restaurants were creating unwanted competition, Mr. Krabs and Plankton worked together to figure out the secret formula behind the Kelp Shakes. When they finally got their hands on one, they went to the Chum Bucket, where Karen analysed the drink and said that the main ingredient was Kelp Juice. Unfortunately, it had dangerous side effects, which Karen tried in vain to warn the duo about. This ingredient was later revealed to be toxic, as it made everybody who drank it grow green hair. When this was discovered, the stores were all closed down at the end of the episode.
Bikini Bottom has professionals draining each stand dry of its toxic waste, which according to them, will take decades.
RestaurantThe Store is a green building in the shape of the bottle it comes in. It served as competition to the Krusty Krab for a short time. The restaurant has a basic interior with tiled floors, a counter, chairs and a big line. They were placed all over Bikini Bottom in random places. A new marketing strategy Mr. Barnacle of Barnacle Products Incorporated came up with. The Kelpshake logo basically displays KELPSHAKE in a red font. The restaurant has the ability to multiply. Despite the fact that it blocked traffic by spawning in the middle of a road, legal action was not taken until the end of the episode, and even then not for this reason.
- In an early Mermaid Man and Barnacle Boy episode, when Mermaid Man was taking along time to order, he looks at the Krusty Krab menu (galley grub) and a Kelp Shake appears on that Menu for $2. This has no relation to the Kelp Shakes in Best Frenemies.
- When the characters drink the Kelpshakes, no fluid is seen swishing about in the bottles. Although it is clear that the beverage is present, it almost looks as if it is not there, and that it is just a bottle.
- It is a parody of a milkshake.
- The presence of the Kelpshake restaurants on either side of the Krusty Krab pokes fun at the similar locations of Starbucks stores unnaturally near other Starbucks stores.
- The Bikini Bottom professionals seemed to have not tried the kelp shake since one of them said they will feel sorry for someone who ever drank it.
- The owner of the Kelpshake restaurant may be a scientist like Plankton, since he made it duplicate and chemicals are present in the drink.
- Two Kelpshake restaurants are seen at both sides of the Krusty Krab - but when we see through the window from the inside (while Krabs and Plankton argue) the Kelpshake restaurants are not there.