SpongeBob SquarePants


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Residence: Pacific Ocean
Color: Green
Classification: Robot
Friends: SpongeBot SteelPants
Employees: Robo-Patrick
Enemies: SpongeBob SquarePants
Patrick Star
Sandy Cheeks
Bikini Bottomites
Series information
First appearance: Battle for Bikini Bottom
Latest appearance: SpongeBob's Truth or Square
List of characters

Robo-Plankton is a robot clone of Plankton. He was a main antagonist in Battle for Bikini Bottom and was the final boss of SpongeBob's Truth or Square. Robo-Plankton is the main hazard inside SpongeBot, attacking SpongeBob in different places. He can be driven off through the use of a bubble attack.


Robo-Plankton's only attack is a sonic energy blast. In SpongeBob's Truth or Square, it's attacks are increased. It has an ability to shoot pellets from its machine gun hand, spitting robots out from its mouth and trying to smack SpongeBob with its fist (which allow SpongeBob to smack it, causing the giant robot's mouth to open and allow SpongeBob to went inside.).

SpongeBob's Truth or Square

Another variant of Robo-Plankton is the final boss in SpongeBob's Truth or Square. This version of the mech is built into the Chum Bucket, and thus, is Gigantic, unlike the Battle for Bikini Bottom version.The robot is not fought directly, like the other robots, and is instead fought from inside. Plankton originally uses this robot to attack Krusty Krab after SpongeBob says that he put the formula in the safe. However, when the robot's antennas are raised, it accidentally being set to attack Bikini Bottom, not Krusty Krab. The robot is destroyed after SpongeBob went inside its head and destroy its core.


  • The Truth or Square's version of the robot has a crossed-out picture of SpongeBob and Patrick on its machine gun hand.
  • During some parts of the battle against the Robo-Plankton (Truth or Square version), there are numerous pictures on the billboards on the buildings. One of them shows a picture of Mr. Krabs from "Krusty Krab Training Video."

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