SpongeBob SquarePants

SpongeBot SteelPants

on ESB
SpongeBot SteelPants
Residence: Pacific Ocean
Aliases: Robot SpongeBob
Physical appearance
Gender: Male
Color: Yellow with Green lightbulb-holes
Eye color: Translucent
Spouse: Robo-Plankton
Friends: Robo-Plankton
Other robots
Enemies: SpongeBob
Series information
Appearance: Battle for Bikini Bottom
List of characters

SpongeBot SteelPants is the final boss from the console and GameBoy Advance versions of Battle for Bikini Bottom.


On the console version, he looks like a bigger, metal version of SpongeBob SquarePants in Karate gear, with jet flames coming out of his pants (allowing him to fly and will damage SpongeBob if he runs into them) and transparent glass-eyes that show the insides of the robot. Its mouth is a speaker shaped in its vein when opened up.

Before the first phase of the boss battle, the robot possesses nine, green-colored energy generators in the form of lights, on points of its body (one on each palm, one on each corner of his face, one on each side of its head, and one on the tip of its nose). These generators are its weak-points which SpongeBob must target with his abilities, and once one is shattered, it cannot be damaged again.

BfBB GBA Screenshot

GBA version.

On the GBA version, it looks the same except he has a Krusty Krab uniform hat, glowing red eyes, and Spat replacing its right hand (much like the Hash Slinging Slasher), and has purely metallic arms in a dark coal shade (the other hand is a clamp). He also has a notable red light as a signal receptor/antenna on the back of its head, and is also much smaller than the console counterpart.



  • Karate Slash: It can swing one of its arms over several platforms via a horizontal chop and freeze in place for a while, leaving a weak-point on its palm or anywhere else vulnerable. Oddly enough, when chopping with its left arm, it chops more inward than with its right arm. Hitting one of its weakpoints during its frozen state and when tri-section of its health bar is two units depleted will cause it to recoil with its hand smacking his own face into unconsciousness.
  • Karate Chop: The robot can karate chop Spongebob, causing him to fall, and take damage while the platform flips. The chop reaches all the way to the bottom central platform.
  • Karate Yell: The robot can scream "KAH-RAH-TAE!" and shoot these words towards the platform Spongebob is standing on, and then shoot towards the two other platforms beside him. Also during this phase, its weak-points one the lower body and its nose are vulnerable to most of SpongeBob's attacks.

Other notes about the battle:

  • As aforementioned, several of its weak-points can be hit by all of SpongeBob's other moves (Bubble Bash being least likely), and not just simply with his Cruise Bubble (e.g. SpongeBob can walk up to one of SpongeBot's palms while he is frozen and hit the palm generator with either a Bubble Spin or Bubble Bounce, as one example of many). However, while they can be hit at anytime, hitting them while the robot about to attack is not a recommended option.
    • In terms of its HP bar, SpongeBot only enters its "next phase" when it has one portion of each tri-section of its HP bar remaining as opposed to a whole tri-section depleted. Said tri-section having one hit point left marks the time when SpongeBot will be unconscious from a weak-point being damaged; while unconscious SpongeBob CANNOT damage any other weak-points until it revives itself.
    • If the weak-points are hit at any other time outside of being frozen from its horizontal chop, then the SpongeBot will perform its normal pain animation always, even if it's left with one portion of a tri-section of its HP bar left.
  • The main bottom and largest platform is center of the whole arena, and has three spring boards needed to hop back up to the main flying platforms circling the robot. If on the bottom central platform or when the SpongeBot is unconscious, Robo-Plankton will attack during that time (and will not stop unless if SpongeBob gets back up to the smaller platforms for the former case, or hits him with an attack in the latter case). Underwear is also on the bottom level if SpongeBob is running low on health.
  • Hitting Robo-Plankton during any period while SpongeBot is unconscious will revive it when SpongeBob gets back up to the upper platforms (or when he gets hit, causing the bigger robot to taunt him and entering back into its normal state).
  • The SpongeBot while unconscious, will only continuously face SpongeBob if he's on the lower platform. Falling off while it is active will cause its attack cycle to be halted and will reset when SpongeBob bounces back up to the higher platforms.
  • These first battle is the only battle with no split-phases in between, as SpongeBob is the only usable character here. This is also the only major boss battle to involve a pit that is "out-of-bounds". If SpongeBob dies normally or goes out of bounds, then the whole battle is reset in those cases (with SpongeBot having full HP and all generators in tact once more).
  • If timed right and if he can avoid the damage as well, SpongeBob can use the platforms flipped by the SpongeBot's Karate Chop and Yell to vault himself at a high height through jumping at the said right time (an exploit of the game's physics).


  • Krabby Patty Bomb: Makes a Krabby Patty Bomb and throws it at the ground via lobbing his spatula hand forward. These are meant to be eaten by Mystery and spit back out at the robot to damage it. Thus, if Mystery is abandoned mid-battle, then the SpongeBot battle will be impossible to win.

Inside the Robot

Once all the weak-points on the robot are destroyed/its HP bar is fully depleted, SpongeBob must go inside and shut down the robot by neutralizing its brain. Inside of SpongeBot's head, there are many platforms and Duplicatron 2000s which will produce various enemies to stop SpongeBob. Along with this, Robo-Plankton will occasionally pop up and try to attack SpongeBob as well. To shut down the metallic monstrosity for good, SpongeBob will need to break all 6 of SteelPants's fuses (which are thin glass tubes circulating electricity) using his bubble weapons.

Brain Cell Fuses

  1. First Cell: Guarded by Tar-Tars and Ham-mers. Once the fuse is unlocked, you can simply destroy it with a midair Bubble Spin.
  2. Second Cell: Protected by Chucks and G-Loves (produced by a Duplicatron from a far away platform which must be destroyed by the Cruise Bubble). This cell is hovering above the ground, so use a Bubble Bash to smash it, but from a far enough distance, a Cruise Bubble can break it if angled upward enough.
  3. Third Cell: Patroled by Fodders and Monsoons, produced by a Duplicatron on a floating platform. This one is lodged into a grate and can only be destroyed with a Bubble Bounce, though it is possible to walk into the grate and hit it with a normal attack.
  4. Fourth Cell: Protected by Monsoons, with a Duplicatron that produces Ham-mers and Chuck. The fourth cell is enclosed in electric fencing, and SpongeBob must use Bubble Bowl or the Cruise Bubble to break it. 
  5. Three remaining Cells: The last three cells are held in the core of the robot's brain and are guarded by Robo-Plankton. Use the Cruise Bubble to take Robo-Plankton down after he shoots his lasers, and to steer it down all three tubes, to destroy the cell at the end. There are a total of three bouncing platforms that Spongebob can use to relocate around the brain, while Robo-Plankton appears everytime the player lands on a new platform, or if the player stays around one of them for too long (where he must be hit again for possible breathing room).


When he was destroyed the first time, the robot started to have an exhausted fit where to he started to flail away at most of the flying platforms of the arena (leaving a few behind it and the one SpongeBob was standing on as the only ones left). Afterwards, it tried to move up towards its original, which its arms falling off and soon the robot started to shut down; all while falling on SpongeBob himself to crush him flat (where its helmet falls off and flies away somewhere). Robo-Plankton soon grew distressed (as it was oddly enough, meant to be "his bride"), and promised to repair the robot.

SpongeBob's efforts were soon shown to be for naught as the SpongeBot soon suddenly grew a pair of Anchor Arms (seen in MuscleBob BuffPants), and Robo-Plankton heads into its head through the robot's "left ear"; thus forcing SpongeBob to dive in after the smaller robot to destroy the metal monster from the inside and starting the second phase of the battle.


SpongeBob used his bubble weapons to smash away at the SpongeBot's generators, and temporarily destroyed SteelPants as aforementioned. However, Robo-Plankton promised to fix it up and soon the SpongeBot remodeled itself and made it impossible to destroy the robot from the outside.

SpongeBob went inside after Robo-Plankton and destroyed the fuses, which eventually caused the SpongeBot to feel funny, causing it to try and force both SpongeBob and Robo-Plankton out the same way they went in. Soon, the robot had its arms deflated suddenly (left arm, then right), which caused the force to push it against a nearby wall. Soon, the robot started to fall over into the large circular gap in the middle of the original arena, causing it to be crunched up and stuck while it soon shut down for good.


  • This is also the only major boss in the game (console versions) where only one character is playable.
  • There is an odd glitch where the player can beat SpongeBot in at least two hits. If the player gets SpongeBot to chop at the platform (attack begins after second hit) and avoids the attack while staying on the platform, SpongeBob will be flung into the air and the scene that plays when the SpongeBot is first defeated is triggered, thus ending the fight.
  • In the second portion inside the robot, if not carefully positioned via one of the re-locating midair spring boards around the robot's brain, it is possible to have SpongeBob return to the starting platform of the level once, as it is below one of the said spring boards around the brain.
  • If SpongeBob is hit by the robot's Karate Chop, Karate Yell, or Robot Plankton's energy cannon during the first part of the fight, SpongeBot will mimic SpongeBob's signature laugh in its robotic voice, complete with placing its hands on its front. Via its horizontal chop however, it will not taunt him and will stay frozen until enough time passes as usual.
  • Even though Robo-Plankton is seemingly the main antagonist of the game, SpongeBot is the one who is considered the final boss.
    Battle for Bikini Bottom music - Final Boss Extended18:01

    Battle for Bikini Bottom music - Final Boss Extended

    Final Boss Theme

    Spongebob Squarepants Battle for Bikini Bottom - Final Boss Ending - Spongebob Steelpants21:27

    Spongebob Squarepants Battle for Bikini Bottom - Final Boss Ending - Spongebob Steelpants

    The Father of All Metal Monstrosities!

  • In some versions of the console versions, the energy lights on one of the sides of the robot's head will be misplaced, almost looking like they have been messed up (the light is jammed in from the side).
  • The cutscene that occurs when the robot is first encountered only plays once per playthrough per file on some versions of the console version.
  • In the cutscene after defeating the boss once, Robo-Plankton will state that he and SpongeBot where to get married the week after the events of the battle.
  • Inside the robot during the second phase of the battle is noticeably much larger than in the cutscenes and during its initial battle. SpongeBob and Robo-Plankton are just as big as its pupil outside of the said playable phase.
    • Also, if a custom camera mod is used for the second cutscene, SpongeBot does not actually increase in size, despite the dialogue and the playable version of inside of its head.
    • During the final cutscene of the game after it's been defeated, its eyelashes disappear. Its energy generators also disappear during the defeat of its first phase, and during the intro cutscene if a camera mod is used. The said generators also are not visible on the robot's HP bar portrait.
  • The second form of the robot with the Anchor Arms was originally to be fought in previous builds of the console versions, along with previous trailers showing brief moments of the battle, but it was eventually scrapped from the final build of the game, for unknown reasons.
    • Recent and careful hacking shows the battle to be playable, as mentioned here more in-depth.
    • The final version of SpongeBot's first phase also has an unused dancing-idle animation where it shuffles its arms.

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