Prisoner SpongeBob

SpongeBob SquarePants (better known as Prisoner SpongeBob) is one of Leader Plankton's prisoners.

Season 1

 * The Take Over! (debut)
 * Life As A Prisoner
 * Squirrel And Plankton Fight (cameo)
 * SpongeBob Escapes
 * The Mystery of the Black Sponge
 * Trip To The Moon (cameo)
 * Back To The Ruled Ocean

Season 2

 * Plankton's Big Birthday Bash
 * Ocean Fright Night of Doom
 * The No Thanks-Giving Gifts To Leader Plankton Special
 * The Fight Against Bubble Buddy
 * The Leader Plankton! Christmas Special
 * It's Almost A New Year!
 * It's a Ruling New Year! (mentioned)
 * The Black Sponge Is At It Again
 * The New Cafeteria
 * Sandy's Easter Friend of Doom (mentioned)
 * 4 Out of 4: Admin Status (cameo)
 * Clem vs. Sheldon (cameo)
 * The Powerful Chum

Season 3

 * Get New Members But Lose The Old

Personality
Prisoner SpongeBob is a sea sponge who tries to always be positive and look on the bright side. Sadly, it's impossible for SpongeBob to be happy about his life as Leader Plankton continually makes his life miserable. He always is trying to keep a smile because Leader Plankton will punish him severely if he is caught crying one bit.

Black Sponge
In the Black Sponge Segment of Leader Plankton!, SpongeBob joined Anti-Plankton to take revenge on LP! and became the Black Sponge. Black Sponge is one of Anti-Plankton's greatest workers and is also their ninja. Leader Plankton severely hates Black Sponge but does not know he's really just Prisoner SpongeBob.