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Sheldon J. Plankton, the owner of the Chum Bucket, has been a staple of Sponge Bob SquarePants since the first season. His nefarious plans are always foiled in one way or another, and his life-long goal of stealing Krabby Patty’s secret formula never leaves him. He’s a beloved character on the show, and fans love to see his plans constantly go to waste.

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Sometimes, however, Plankton shows a more caring side. This adds depth to her character and further contributes to her popularity as a character. There are episodes that give Plankton the storylines he deserves, allowing him to show more of his personality.


SpongeBob and Plankton sing the song FUN.

Often remembered as one of the Sponge Bob SquarePantsfunniest episodes of, this episode was the first to show a nicer side to Plankton. When he befriends SpongeBob SquarePants, he seems to genuinely enjoy having a friend before resuming his usual ways of attempting to steal the formula.

While he’s ultimately the episode’s villain, he’s given a more three-dimensional story, which teases that there could be more to him than just theft. This episode also features one of the most iconic songs from the entire series, making it one of the most-cited episodes.

9 Plankton!

Plankton in his debut in the first season of Spongebob Squarepants.

Sheldon J. Plankton’s first appearance shows him attempting to steal a Krabby Patty, first by himself and then taking over Spongebob’s brain. While this episode certainly portrays him as an unforgivable villain, it also portrays him as a comedic relief.

It is clear from this appearance that Plankton will stop at nothing to steal the Secret Formula, and it shows just how willing he is to go to get it. Plankton’s attempts to steal would become one of the funniest racing gags in the world Sponge Bob SquarePants series.

8 Fry Cook games

SpongeBob SquarePants and Patrick in the SpongeBob SqurePants The Frycook Games episode.

While not the antagonist in his usual way, Plankton catalyzes the episode’s conflict. As SpongeBob SquarePants prepare to compete in the Fry Cook Games, Plankton hires Patrick to compete with him. This results from a previous disagreement between the two friends.

Plankton is presented in a different light in this episode, being treated as a legitimate competitor to the Krusty Krab as opposed to a failed restaurateur. He and Mr. Krabs have an old rivalry in games, which gives their relationship more depth.

7 Imitation of crabs

SpongeBob SquarePants and Mr. Krabs from the Imitation Krabs episode of SpongeBob SquarePants.

When he creates a robotic version of Mr. Krabs to trick the Krusty Krab employees into giving him the secret formula, Plankton gains the upper hand when faced with Spongebob. Plankton’s presence in this episode is so interesting because it shows how far he’s willing to go to get what he wants, including spending time with SpongeBob SquarePants for several hours.

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In the end, he would have succeeded without an unfortunate self-destruct streak. Some of Plankton’s most memorable moments come from this episode, largely from his frustration.

6 Group geeks

Plankton in the SpongeBob SqurePants Band Geeks episode.

While the episode is partly famous for one of Patrick’s funniest quotes, it’s also a great episode for Plankton. Although he doesn’t introduce him much, his appearances are incredibly memorable. Most notable involves Squidward checking the progress of his party members.

When it comes to Plankton, Sheldon demonstrates his harmonica skills, running up and down the harmonica to play notes. He collapses to the ground at the end, exhausted from his actions. This track, although brief, is one of the funniest of the episode. It’s also one of the first times Plankton appears in an episode in a non-evil role.

5 Friend or enemy

Still from the SpongeBob SquarePants movie Friend or Foe.

The origin story of Plankton and Mr. Krabs’ relationship, this episode shows them both in a whole new light. While the two have their own take on events from their past, it’s clear that they once cared deeply for each other until an argument tore them apart.

This adds an important layer to Plankton’s story, showing why he is so interested in the Secret Formula. As the episode ends with Plankton participating in his usual antics, it shows that it’s possible the two could one day reconcile.

4 Krusty Krab training video

SpongeBob SquarePants plankton goes to maximum overdrive.

Plankton is featured in a short section of the video it is about. He is shown attempting to steal a Krabby Patty and is almost immediately thwarted. This brief but memorable appearance shows just how interesting a character, Plankton, only needs to be in one episode for several seconds to leave an impression.

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It also shows that plankton is such a well-known part of the Krusty Krab that it requires an entire section devoted to its antics. This adds to the humor of the situation.

3 Army of plankton

Photo from the SpongeBob SqurePants episode, Plankton's Army.

When Plankton wants to recruit family members to help him steal the Secret Formula, he is surprised when he finds out that they are not what he expected. Either way, his plan works, although the formula he finds is a delusion.

Perhaps the most memorable part of this episode is the revealing of Plankton’s first name. It is still one of the most famous moments of the series. As the plan ends in defeat, this episode shows that Plankton is capable of pulling off his evil plan.

2 Algae are always greener

Plankton in the SpongeBob SquarePants episode Algae are always greener

A disgruntled plankton uses an invention to trade lives with Mr. Krabs, becoming the owner of the Krusty Krab. He learns that this life may not be everything he imagined, and he learns to enjoy his existence more. This instance is unique because it is one of the rare appearances of Plankton where he does not end up looking for the secret formula.

This episode is one of the times that many fans have felt bad for Plankton, but it has learned a valuable lesson. He’s embracing aspects of his life that he previously didn’t enjoy, demonstrating unusual character growth for the series villain.

1 Best enemies

Still from SpongeBob SquarePants' Best Frenemies episode.

Longtime enemies, Plankton and Mr. Krabs team up in an attempt to dismantle a business that threatens them both financially. The two are arguing for much of their temporary partnership, but it’s clear at times that they have some sort of respect for each other.

By the end of the episode, the two seemingly enjoy each other’s company, further reinforcing the idea that they aren’t mortal enemies after all. This episode is one of the best in Plankton, as it shows him in a very different capacity than many other episodes.

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