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Appearances
Plankton was first created by Stephen Hillenburg as a potential villain for the show. However, he later feared that Plankton's stories would get repetitive and predictable. During the production of season one, Hillenburg demoted Plankton from a main character to a minor one; he insisted that Plankton would work better as a one-time guest star.

However, Doug Lawrence loved the character. He summarized Plankton's origins in 2015, saying that he "was only supposed to be in one or two episodes, but I was a writer on the show and I really liked this character."[1] Lawrence wrote episode ideas for Plankton and passed them to Hillenburg.[1] From then on, Plankton began to appear more often. Lawrence's most notable contribution was giving a personality to Plankton's "waterproof computer," named Karen after Stephen Hillenburg's wife. He decided that Plankton and Karen should be an inseparable duo, with Karen as the brains of the operation, always supplying Plankton with evil plans.

Since Plankton's "reinvention" by Lawrence, he and Karen have appeared in many episodes. They were both officially promoted to main characters in the credits of the 2004 film and have been part of the main cast ever since. Plankton has also appeared in various video games.

Episodes

Image # Title Role in episode
Season 1
Plankton! 174
3b
"Plankton!" (tr) Major
Culture Shock 103
10a
"Culture Shock" (tr) Minor
F.U.N 096
10b
"F.U.N." (tr) Major
Sleepy Time 134a
15a
"Sleepy Time" (tr) Supporting
Valentine's Day 013
16a
"Valentine's Day" (tr) Non-speaking cameo
Walking Small 139
18b
"Walking Small" (tr) Major
Season 2
Imitation Krabs 110
24b
"Imitation Krabs" (tr) Major
N/A
27b
"Life of Crime" (tr) Mentioned
Christmas Who 174
28
"Christmas Who?" (tr) Cameo
Welcome to the Chum Bucket 104
34a
"Welcome to the Chum Bucket" (tr) Major
Band Geeks 172
35b
"Band Geeks" (tr) Supporting
The Fry Cook Games 087
39b
"The Fry Cook Games" (tr) Major
Season 3
The Algae's Always Greener 061
41a
"The Algae's Always Greener" (tr) Major
Mermaid Man and Barnacle Boy IV 108
45a
"Mermaid Man and Barnacle Boy IV" (tr) Cameo
Snowball Effect 031
46a
"Snowball Effect" (tr) Cameo
Krusty Krab Training Video 154
50b
"Krusty Krab Training Video" (tr) Supporting
Party Pooper Pants 195
51
"Party Pooper Pants" (tr) Supporting
Plankton's Army 049
58b
"Plankton's Army" (tr) Major
The Sponge Who Could Fly 261
59
"The Sponge Who Could Fly" (tr) Minor
SpongeBob Meets the Strangler 160
60a
"SpongeBob Meets the Strangler" (tr) Cameo
Season 4
Fear of a Krabby Patty 072
61a
"Fear of a Krabby Patty" (tr) Major
Krabs vs. Plankton 112
62b
"Krabs vs. Plankton" (tr) Major
Planktonamor
66
"Dunces and Dragons" (tr) Major, medieval ancestor appears instead
Enemy In-Law 199
67a
"Enemy In-Law" (tr) Major
Mermaid Man & Barnacle Boy VI The Motion Picture 110
67b
"Mermaid Man & Barnacle Boy VI: The Motion Picture" (tr) Minor
Patrick SmartPants 062
68a
"Patrick SmartPants" (tr) Cameo
Wishing You Well 189
72b
"Wishing You Well" (tr) Supporting
New Leaf 188
73a
"New Leaf" (tr) Major
Best Frenemies 161
78b
"Best Frenemies" (tr) Major
Season 5
Friend or Foe 371
81
"Friend or Foe" (tr) Major
Spy Buddies 230
84a
"Spy Buddies" (tr) Major
Krabs à la Mode 098
85b
"Krabs à la Mode" (tr) Major
Bucket Sweet Bucket 018
86b
"Bucket Sweet Bucket" (tr) Major
Goo Goo Gas 145
91a
"Goo Goo Gas" (tr) Major
Atlantis SquarePantis 698
92
"Atlantis SquarePantis" (tr) Major
Mermaid Man vs. SpongeBob 034
94b
"Mermaid Man vs. SpongeBob" (tr) Major
20,000 Patties Under the Sea 063
97a
"20,000 Patties Under the Sea" (tr) Major
Banned in Bikini Bottom 093
100a
"Banned in Bikini Bottom" (tr) Major
Stanley S. SquarePants 200
100b
"Stanley S. SquarePants" (tr) Cameo
Season 6
Krabby Road 016
101b
"Krabby Road" (tr) Major
Spongicus 091
103a
"Spongicus" (tr) Major
Patty Caper 071
108a
"Patty Caper" (tr) Minor
Plankton's Regular 022
108b
"Plankton's Regular" (tr) Major
The Krabby Kronicle 125
109b
"The Krabby Kronicle" (tr) Minor
Komputer Overload 047
118b
"Komputer Overload" (tr) Major
Chum Bucket Supreme 024
122a
"Chum Bucket Supreme" (tr) Major
Single Cell Anniversary 145
122b
"Single Cell Anniversary" (tr) Major
Truth or Square 092
123-124
"Truth or Square" (tr) Major
Chum Caverns 050
125b
"Chum Caverns" (tr) Major
Season 7
Tentacle-Vision 148
127a
"Tentacle-Vision" (tr) Minor
Someone's in the Kitchen with Sandy 126
129a
"Someone's in the Kitchen with Sandy" (tr) Major
The Inside Job 050
129b
"The Inside Job" (tr) Major
Greasy Buffoons 131
130a
"Greasy Buffoons" (tr) Major
SpongeBob's Last Stand 313
134
"SpongeBob's Last Stand" (tr) Major
One Coarse Meal 124
137a
"One Coarse Meal" (tr) Major
The Play's the Thing 192
138a
"The Play's the Thing" (tr) Non-speaking cameo
Rodeo Daze 142
138b
"Rodeo Daze" (tr) Supporting
Gramma's Secret Recipe 109
139a
"Gramma's Secret Recipe" (tr) Major
Welcome to the Bikini Bottom Triangle 190
140b
"Welcome to the Bikini Bottom Triangle" (tr) Minor
The Main Drain 204
141b
"The Main Drain" (tr) Supporting
The Great Patty Caper 084
143
"The Great Patty Caper" (tr) Major
That Sinking Feeling 180
144a
"That Sinking Feeling" (tr) Cameo
Buried in Time 199
145a
"Buried in Time" (tr) Supporting
Shellback Shenanigans 038
147b
"Shellback Shenanigans" (tr) Major
Perfect Chemistry 126
152b
"Perfect Chemistry" (tr) Major
Season 8
The Other Patty 077
153b
"The Other Patty" (tr) Major
Drive Thru 173
154a
"Drive Thru" (tr) Minor
Frozen Face-Off 017
156
"Frozen Face-Off" (tr) Major
Squidward's School for Grown-Ups 025
157a
"Squidward's School for Grown-Ups" (tr) Cameo
Sweet and Sour Squid 027
158a
"Sweet and Sour Squid" (tr) Major
A SquarePants Family Vacation 015
159
"A SquarePants Family Vacation" (tr) Cameo
Walking the Plankton 058
160b
"Walking the Plankton" (tr) Major
Plankton's Good Eye 070
163b
"Plankton's Good Eye" (tr) Major
The Krabby Patty That Ate Bikini Bottom 123
167a
"The Krabby Patty That Ate Bikini Bottom" (tr) Minor
Fiasco! 101
168b
"Fiasco!" (tr) Major
Free Samples 008
170a
"Free Samples" (tr) Major
Karen 2.0 164
171a
"Karen 2.0" (tr) Major
For Here or to Go 188
174b
"For Here or to Go" (tr) Major
It's a SpongeBob Christmas! 179
175
"It's a SpongeBob Christmas!" (tr) Major
Super Evil Aquatic Villain Team Up is Go! 174
176a
"Super Evil Aquatic Villain Team Up is Go!" (tr) Major
Chum Fricassee 040
176b
"Chum Fricassee" (tr) Major
The Good Krabby Name 069
177a
"The Good Krabby Name" (tr) Cameo
Move It or Lose It 086
177b
"Move It or Lose It" (tr) Major
Hello Bikini Bottom! 397
178
"Hello Bikini Bottom!" (tr) Cameo
Season 9
Squirrel Record 061
179b
"Squirrel Record" (tr) Minor
Eek, an Urchin! 138
183a
"Eek, an Urchin!" (tr) Major
Jailbreak! 117
184a
"Jailbreak!" (tr) Major
Evil Spatula 200
184b
"Evil Spatula" (tr) Major
It Came from Goo Lagoon 084
185
"It Came from Goo Lagoon" (tr) Major
Plankton's Pet 044
186b
"Plankton's Pet" (tr) Major
Company Picnic 181
192a
"Company Picnic" (tr) Major
Married to Money 044
196b
"Married to Money" (tr) Major
CopyBob DittoPants 152
198b
"CopyBob DittoPants" (tr) Major
Lame and Fortune 095
199b
"Lame and Fortune" (tr) Major
Goodbye, Krabby Patty 226
200
"Goodbye, Krabby Patty?" (tr) Minor
Pineapple Invasion 002
203a
"Pineapple Invasion" (tr) Major
Salsa Imbecilicus 039
203b
"Salsa Imbecilicus" (tr) Major
Mutiny on the Krusty 062b
204a
"Mutiny on the Krusty" (tr) Non-speaking cameo
Season 10
Mimic Madness 044
207a
"Mimic Madness" (tr) Supporting
House Worming 077
207b
"House Worming" (tr) Minor
Plankton Gets the Boot 051
209b
"Plankton Gets the Boot" (tr) Major
Burst Your Bubble 082
210b
"Burst Your Bubble" (tr) Supporting
Plankton Retires 037
211a
"Plankton Retires" (tr) Major
The Incredible Shrinking Sponge 146
212a
"The Incredible Shrinking Sponge" (tr) Minor
N/A
215a
"Feral Friends" (tr) Deleted scene[2]
Season 11
Spot Returns 016
217a
"Spot Returns" (tr) Major
Spin the Bottle 007
218a
"Spin the Bottle" (tr) Major
The Legend of Boo-Kini Bottom 114
220
"The Legend of Boo-Kini Bottom" (tr) Supporting
No Pictures Please 153
221a
"No Pictures Please" (tr) Supporting
Krabby Patty Creature Feature 137
222a
"Krabby Patty Creature Feature" (tr) Supporting
Teacher's Pests 099
222b
"Teacher's Pests" (tr) Major
N/A
228a
"Fun-Sized Friends" (tr) Mentioned
Grandmum's The Word 035
228b
"Grandmum's the Word" (tr) Major
Bottle Burglars 043
230b
"Bottle Burglars" (tr) Major
Shopping List 195
232b
"Shopping List" (tr) Major
Patnocchio 073
234a
"Patnocchio" (tr) Major
Plankton Paranoia 122
235a
"Plankton Paranoia" (tr) Major
Call the Cops 014
236a
"Call the Cops" (tr) Major
Surf N' Turf 042
236b
"Surf N' Turf" (tr) Minor
Appointment TV 117
238a
"Appointment TV" (tr) Supporting
Karen's Virus 016
238b
"Karen's Virus" (tr) Major
The Grill is Gone 127
239a
"The Grill is Gone" (tr) Minor
Girls' Night Out 083
240b
"Girls' Night Out" (tr) Supporting
Season 12
Gary & Spot 042
242b
"Gary & Spot" (tr) Minor
The Krusty Slammer 133
244a
"The Krusty Slammer" (tr) Major
King Plankton 043
245b
"King Plankton" (tr) Major
Plankton's Old Chum 180
246a
"Plankton's Old Chum" (tr) Major
The Krusty Bucket 043
248a
"The Krusty Bucket" (tr) Major
Sandy's Nutty Nieces 083
249a
"Sandy's Nutty Nieces" (tr) Likeness only
Karen's Baby 034
250b
"Karen's Baby" (tr) Major
Senior Discount 191
251b
"Senior Discount" (tr) Minor
SpongeBob's Big Birthday Blowout 447
254-255
"SpongeBob's Big Birthday Blowout" (tr) Supporting
Handemonium 111
257a
"Handemonium" (tr) Major
The Ghost of Plankton 018The Ghost of Plankton 040
259a
"The Ghost of Plankton" (tr) Major
My Two Krabses 087
259b
"My Two Krabses" (tr) Minor
InShot 20200723 210924581
261b
"Hiccup Plague" (tr) Minor
The Hankering 127
262b
"The Hankering" (tr) Supporting
Who R Zoo 163
263a
"Who R Zoo?" (tr) Minor
Screenshot 20200708-152921
263b
"The Kwarantined Krab" (tr) Minor
Vlcsnap-2020-07-02-10h03m05s494
264a
"Plankton's Intern" (tr) Major
N/A
267b
"Dream Hoppers" (tr) Cameo in Mr. Krabs' dream (non-speaking)

Shorts

Image # Title Role in episode
PHH9
"Plankton's Holiday Hits" (tr) Major
Plankton sleeping with a floater
"Can't Swim" (tr) Supporting
Remodeling004
"Remodeling" (tr) Supporting
Loop dee Loop 04
"Loop dee Loop" (tr) Minor
Plankton Pays 017
"Plankton Pays" (tr) Major
SpongeBob's Legendary Dance Party - Screenshot 06
"SpongeBob's Legendary Dance Party" (tr) Minor
Plankton's Color Nullifier 022
"Plankton's Color Nullifier" (tr) Major

Movies

Image # Title Role in episode
The SpongeBob SquarePants Movie 066The SpongeBob SquarePants Movie 386
F1
"The SpongeBob SquarePants Movie" (tr) Major
The SpongeBob Movie Sponge Out of Water 454The SpongeBob Movie Sponge Out of Water 789
F2
"The SpongeBob Movie: Sponge Out of Water" (tr) Major
Image1101
F3
"The SpongeBob Movie: Sponge on the Run" (tr) N/A

Miscellaneous

References

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