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It is a darkish yellow metallic bipedal robot that looks similar in appearance to SpongeBob except for its lightbulb eyes, a metal bolt for its nose, a frowning mouth with glowing teeth, and a tail pipe behind it. One of the largest differences between SpongeBob and Robot SpongeBob is that Robot SpongeBob has a transparent glass container on its head that is filled with fluids, and it can hold SpongeBob's brain so that Plankton can get a Krabby Patty. Robot SpongeBob also has one arm that looks like a Spatula and another that is a metal pincer.
"Goodbye, Krabby Patty?"
It appears to look like SpongeBob, just that it is put together with metal. 
It has the same general appearance as SpongeBob but he is made of metal and has no porous holes on him.
"Welcome to the Chum Bucket"
Robot SpongeBob was a robot created by Plankton to force SpongeBob in to making a Krabby Patty and is confirmed as plan B. A few months after Plankton had failed to get win the card games he played with Mr. Krabs to get the secret Krabby Patty formula, he had finally won the card game (after cheating) and had then won SpongeBob's contract so he could work at the Chum Bucket. SpongeBob did not have the proper ingredients to cook a Krabby Patty, but he was to be treated with compassion and understanding. Later, SpongeBob became less disciplined, and called Plankton a bad name. Plankton took out his brain and put it into Robot SpongeBob, Plankton programmed the robot to make him a Krabby Patty, but SpongeBob talked through the robot by saying "Dee dee doodle dee dee doo. Response: Why don't you ask me later?". Then Plankton yelled at him to follow his order, but SpongeBob said "I don't wanna.", and Robot SpongeBob lazily drank a can of oil while reading a comic book that had a comic strip of SpongeBob, Patrick and Squidward. Personality-wisely, it is shown to be sassy and trick Plankton by replying with a refusal response to follow his command to make him a Krabby Patty. The robot used that reaction, because it had SpongeBob's brain, which has his personality, thoughts and memories in it. Plankton just gave the brain a new body to maintain the brain which ultimately back fired which does not change that SpongeBob is taking advantage of Plankton. It is also shown he likes to drink oil and read comic books. Plankton becomes frustrated and puts the brain back into SpongeBob, himself. He also appears in the PC version of The SpongeBob SquarePants Movie (video game) where Plankton must distract him to grab the jetpack without being crushed. Later, SpongeBob must avoid being seen by him in a maze while grabbing Krabby Patties.
"Goodbye, Krabby Patty?"
Robot SpongeBob is seen at the Krusty Krab at the kitchen. The real SpongeBob kicked it when he knowed that the frozen krabby patties are made with sand.
I can turn into a skyscraper!
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It is called three original names: "RobotBob SpongeChefPants", "Robot SpongeBob" and "RoboSponge".
Plankton called him "SpongeBot SquareShiftPants", which is not to be confused with SpongeBot SteelPants.
The premise of Robot SpongeBob is similar to The Simpsons' Treehouse of Horror II segment titled "If Only I Had a Brain," featuring Homer's nightmare. Homer, a lazy worker, is kidnapped by Mr. Burns and Smithers, who put his brain into a robot. The robot ends up being lazy and refusing to work, just like Homer.
Part of the control panel of Glove World in "Tunnel of Glove" looks just like the robot.
The robot is an obvious parody of Frankenstein's Monster, because in the book/movie Dr. Frankenstein puts corpse body parts to make the monster come to life, as in here SpongeBob's Brain is transferred into the robot.