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SpongeBob, meet SpongeBot.
~ Robo-Plankton as SpongeBot SteelPants makes his entrance
~ SpongeBot SteelPants during his karate yell attack

SpongeBot SteelPants is the secondary antagonist and the final boss of the video game SpongeBob SquarePants: Battle for Bikini Bottom and its 2020 remake Battle for Bikini Bottom - Rehydrated.

Despite looking male like the regular SpongeBob, he is classified as a female according to his fiancé Robot Plankton, and they were going to be wedded the week after their global takeover.

Much like his regular incarnation, he was voiced by Tom Kenny.


Depending on which version he is fought in, SpongeBot has a different appearance.

In the console versions, he is a massive metallic version of SpongeBob SquarePants in karate gear with jet flames coming out of his pants (allowing him to fly and damage SpongeBob through contact), transparent eyes, and a mouth in the shape of a speaker. In the GBA version, he is only twice the size of SpongeBob with red eyes and a metallic Krusty Krab hat. He also has a claw left hand and a spatula right hand.


SpongeBob, Patrick, Squidward, and Sandy find the massive SpongeBot within the Chum Bucket once 70 Golden Spatulas were collected. They discover that Plankton was behind the robots, showing the heroes that he accidentally forgot to switch the Duplicatron 3000 control to "Obey Plankton". Robo-Plankton reveals himself as the true leader of the robots and orders SpongeBot to destroy SpongeBob and his friends. The battle takes place in the Chum Bucket lab with the roof cut open and the floor partially destroyed.

Console Version

SpongeBot has nine generators on his body that are his weak spots: two on his hands, four on each side of his head, two on the sides of his body, and one on the tip of his nose. While the two on his hands can be destroyed by the Bubble Bounce, the rest must be destroyed with the Cruise Bubble (or less accurately with a Bubble Bowl). SpongeBot shares three of his health points with Robo-Plankton, who shoots at SpongeBob each time three generators (two for the first time) on SpongeBot are hit and must be taken down either with a spin attack or a Cruise Bubble. SpongeBot's attacks by karate chopping at the platforms SpongeBob stands on, and always ends with a karate slap, where he rests himself for a while, allowing SpongeBob to hit him with a Cruise Bubble. As he loses more generators, SpongeBot's attacks get more aggressive as the fight continues. He will throw more chops at SpongeBob and performs the "Kah-Rah-Tae" ability, where the three syllables pop out of his mouth and hit the three platforms he stands before. 

After all nine generators are destroyed, SpongeBot falls defeated (landing on SpongeBob in the process), but is revived thanks to Robo-Plankton and grows Anchor Arms. SpongeBob follows Robo-Plankton into SpongeBot through his ear. To progress through the inside of the robot, SpongeBob hits several fuses throughout the robot's body, while also destroying robot enemies and avoiding Robo-Plankton's laser beam. Once the three fuses in his "brain" are hit, SpongeBot knocks SpongeBob and Robo-Plankton out of his head before his anchor arms deflate and he collapses backwards.

Gameboy Advance Version

SpongeBot is fought as soon as the main Duplicatron 3000 is destroyed. In this version, SpongeBot's only attack is throwing Krabby Patty bombs at SpongeBob, which can be eaten and spat out by Mystery back at the robot, meaning the fight cannot end without her. Only six bombs are required to take SpongeBot down. Since the arena fought on a conveyor belt, SpongeBob and Mystery must keep moving to the left of the screen while jumping over the bombs to avoid falling to their deaths.





  • SpongeBot MusclePants was meant to be his own boss fight instead of just a cutscene, but the phase was cut due to technical limitations or time restrictions. The fight can be played through the game's coding, but it is unbeatable due to collision errors with the machine's arms, with the game crashing if they attack the player.
    • Since the unused fight is playable with Patrick, it is possible that the boss was meant to have multiple phases with each of the playable characters, SpongeBob, Patrick, and Sandy, with each character having their own specific phase during the fight, similar to the boss battles against Robo-Sandy and Robo-Patrick.
  • The first phase of the battle had an idle animation cut from the game where it shuffles its arms. This is presumably to happen whenever SpongeBob stayed underneath the arena for too long.
  • It is possible to defeat both phases of the console version without using the Cruise Bubble.
  • SpongeBot does not appear in the PC version of Battle for Bikini Bottom.
  • In Rehydrated, SpongeBot's destroyed muscle arms and body appear as islands in the multiplayer horde mode.


           SpongeBob.png Villains

Main Villains
Mr. Krabs | Plankton | Karen Plankton | Mrs. Puff

Major Villains
Flying Dutchman | Man Ray | Sinister Slug | Jumbo Shrimp | Atomic Flounder | Dirty Bubble | Bubble Bass | Plankton Family | DoodleBob

Movie Villains
The SpongeBob Squarepants Movie:
Mr. Krabs | Mrs. Puff | Plankton | Dennis | Karen Plankton | Victor | Cyclops | Boat Jacker | The Thug Tug Gang
The SpongeBob Movie: Sponge Out of Water:
Plankton | Mr. Krabs | Burger-Beard
The SpongeBob Movie: Sponge On the Run:
Plankton | Mr. Krabs | Karen Plankton | King Poseidon | El Diablo

Super Villains
The Moth | Catfishstress | Octopus King | Hoodoo Guru | Robot Mantis

Alaskan Bull Worm | Puffy Fluffy | Big One | BlackJack SquarePants | Sea Bear | Evil Alien Jellion Overlord | Dragon Jellyfish | The Jellions | Jelliens | Kraken | Krabby Patty Zombies

Evil Organizations
Every Villain Is Lemons | Evil Syndicate

Sergeant Sam Roderick | Tattletale Strangler | Howard Blandy | Carl | Con Man | Master Udon | Don Grouper | Animatronic Hieronymus Glove | Madame Hagfish | Art Appraiser | Miss Gretel Puss | Flats the Flounder | Gale Doppler | Stickyfins Whiting | Dorsal Dan

The Fisherman | Hash-Slinging Slasher | Count Orlok

Abrasive SpongeBob | Dead-Eye Plankton | Planktonamor | Dreaded Patrick | Karen 2.0 | Captain Scarfish | ToyBob | Mini Doodles | Plankrab | Doctor Negative | Alternate Reality Mr. Krabs

Lord Poltergeist | Gordon


Video-Game Villains
King Gorge | The Mawgu | SpongeBot SteelPants | Robot Plankton | Robo-Patrick | Robots | Globulous Maximus | Seymour Scales

Other Animals
Triton | Cuddle E. Hugs | Swamp Natives | Earworm