Robo-Plankton is a much larger version of Plankton made entirely of metal, with red spheres on top of his antennae. He sits on a bench placed on a large platform that has rocket boosters and a wave emitter that looks like a satellite dish. He can manipulate the rocket boosters to make the platform fly by using two control sticks with his arms.
Role in games
Robo-Plankton appears in the Chum Bucket Lab as one of the two main robots opposing the player, the other being SpongeBot SteelPants. In the first stage of the player's battle against SpongeBot, they must periodically attack Robo-Plankton to continue the fight. In the second stage, inside of SpongeBot, the player must again periodically attack Robo-Plankton to advance the platforms or to get an opportunity to attack SpongeBot's brain.
After SpongeBot is destroyed, Robo-Plankton vows to summon the remaining robots and exact revenge, but the Duplicatotron 3000 starts producing numerous Robo-Plankton copies, all of which fight each other over who will destroy the rest. Their ultimate fate is unknown.
In all versions of Rehydrated, players can play as Robo-Plankton in the multiplayer horde mode, making Robo-Plankton the first and only playable robot from any version of Battle for Bikini Bottom.