- SpongeBob SquarePants
- Karen Plankton
- Eugene H. Krabs
- Sheldon J. Plankton
- Squidward Tentacles
- Karen 2 (debut)
- Nancy Suzy Fish
- Ivy (gray)
- Frankie Billy
- Norma Rechid
- Abigail Marge
- Martha Smith
- Jennifer Millie
- Tina Fran
- Harry (fish) (purple)
- Frank (red shirt)
- Nat Peterson
- Harold Bill Reginald Scott
- Medley Fishbowl
- Fred (blue)
- Dennis (citizen)
- Miss Rechid
- Nathiel Waters
- Nancy Suzy Fish
- Old Man Jenkins
- Taylor Fishbowl
- Monroe Timmy
- Jimmy Gus
- Vera Fishbowl
At the Chum Bucket, Karen dumps a bag of chum onto a tray and zaps it into a three course meal, the entree being chum pot pie. She goes to Plankton, who works on a project. Annoyed, he tells her the pot pie chum was supposed to be a stir fry chum, and she responds that her memory is full. Plankton says such problems will be solved by his newest creation, which he reveals to be Karen 2. Karen is distraught that Plankton is replacing her, and his words anger Karen to the point where she tries to zap him. He flees from her blasts, but Karen 2 shuts her off via the Chum Bucket's power source. At the Krusty Krab, it's closing time, which makes SpongeBob sad. Mr. Krabs walks home as SpongeBob follows him and says goodbye until he trips over a box filled with Karen's components. Mr. Krabs is about to get away until SpongeBob points out the "free" computer. Mr. Krabs rushes back, feeling anything free should be taken.
They go back to the Krusty Krab, where they activate the computer, who turns out to be Karen. SpongeBob is wary that it may be one of Plankton's schemes, but Mr. Krabs is convinced that anything free is automatically good. When Karen's startup is completed, the screen turns to a face, crying. SpongeBob tries to comfort her, but he unintentionally makes her even more depressed. Karen looks out the window of the Krusty Krab, where she sees Plankton and Karen 2 having a romantic dinner at the Chum Bucket. She angrily says she never wants to see Plankton again, and Mr. Krabs welcomes her to the Krusty Krab crew.
The next day, Squidward walks in to see Karen is at his post. He is baffled until Mr. Krabs explains that she will be doing his cashier duties for free. Squidward jumps for joy at the thought of no longer working at the Krusty Krab and dealing with SpongeBob or customers, but his joy is quashed when Mr. Krabs reassigns him to restroom duties. Unfortunately, Karen is still upset, even snapping at a customer who requests a Krabby Patty. A knocking is heard at the front door: it's Karen 2, who repeatedly slams into the front door. Plankton pops out from inside her, asking what's wrong, and she tells him he didn't program her with arms. Plankton sees Karen at work, and becomes uneasy, then a wave of customers pushes him and Karen 2 into the Krusty Krab. Karen and Karen 2 argue, reaching the point that Karen jumps out of her post, ready to fight Karen 2. Mr. Krabs uses the opportunity to make money from people betting on the fight.Karen and Karen 2 fight, striking each other. When Plankton falls out of Karen 2, she accidentally runs him over and crushes him, and Karen is horrified. Karen 2 is unconcerned, which infuriates Karen, who finally destroys her replacement. She talks to a wounded Plankton, who sees the error of his ways in replacing her. Karen's power runs out, and Plankton takes the battery from the destroyed body of Karen 2 and puts it into her. Karen revives, thinking it was all a dream. She and Plankton return to the Chum Bucket, and Karen 2's screen explodes. Mr. Krabs is upset over the loss of Karen, but when SpongeBob suggests that he rebuild Karen 2, he has Squidward wearing Karen 2's screen like a mask and take orders, because "the kids love robots."
|( ‣ ) Associated production music|
|( • ) Original music|
|( ◦ ) SpongeBob music|
‣ Wooden Bear - Gil Flat, Tony Tape, Florian Voelxen [opening]
‣ Tragic Bridge 2 - Phil Green [Karen 2.0 introduced]
‣ Befuddled Gent - Phil Green ["Who are you calling cheap?"]
‣ Death of the Alien 1 [#38] - Harry Bluestone, Emil Cadkin [Loading Jealousy Scheduler]
‣ Zelle 501 - Gerhard Trede ["Goodbye Karen classic, hello Karen 2.0!"]
‣ Salty Krab Jig - Michael Bolger, Nicolas Carr [Krabs locks the Krusty Krab/SpongeBob and Krabs discover a box with Karen's head.]
‣ Drama Link (g) - Hubert Clifford ["Are computers supposed to emote?"]
‣ Tragic Situation - Phil Green ["She's malfunctioning."]
‣ Saltwater Works - Nicolas Carr, Sage Guyton, Jeremy Wakefield [SpongeBob talks to Karen]
‣ Sailor's Sting 15 - Michael Bolger, Nicolas Carr ["Careful, Mr. Krabs."]
‣ Lounging and Fine Dining - Nicolas Carr, Barry Anthony [Plankton having dinner with Karen 2.0]
‣ Sailor's Sting 15 - Michael Bolger, Nicolas Carr ["I don't ever want to see that lowlife again!"]
• Hot Steel and Slide Licks (e) - Jeremy Wakefield [Krabs hires Karen]
‣ Hawaiian Slide - Nicolas Carr, Jeremy Wakefield [Krabs and SpongeBob high five each other.]
‣ Happy Sack Shanty - Michael Bolger, Nicolas Carr [the next day]
‣ Hot Steel and Slide Licks - Jeremy Wakefield [Squidward cleaning the bathroom]
‣ Sailor's Sting 20 - Michael Bolger, Nicolas Carr [Karen snaps at a customer]
‣ Salty Krab Jig - Michael Bolger, Nicolas Carr ["You know what cheers me up when I'm feeling down?"]
‣ Vibe Sting - Nicolas Carr [banging at door]
‣ Clowning Around Again - Nicolas Carr, Barry Anthony ["Hey, what's the holdup?"]
‣ Dramatic Bridge 4 - Phil Green ["What's she doing here?!"]
‣ Sailor's Sting 15 - Michael Bolger, Nicolas Carr ["Well, if isn't little-miss homewrecker."/Karen arguing with Karen 2.0.]
‣ Tales from the Swamp (c) - Ron Goodwin [everyone gasps]
‣ Harp Ding - Nicolas Carr ["Excuse me, did you say money?"]
‣ Unknown Track 27 - Fabian Fernandez [Karen, Karen 2.0 fighting/"You heartless homepage-wrecking hussy!"]
‣ Tabu - Daryl Neil Alexander Griffith ["Planky, say something!"]
‣ Dramatic Impact 2 - Ivor Slaney [Karen shuts off]
‣ Tragic Bridge 3 - Phil Green ["Karen!"]
‣ Melodrama 29 - Harry Bluestone, Emil Cadkin [Plankton replaces Karen's battery]
‣ Puka A - Sage Guyton, Jeremy Wakefield [Karen reboots]
‣ Puka B - Sage Guyton, Jeremy Wakefield ["Well, we could rebuild Karen 2."]
‣ Lopey Sailor's Jig - Michael Bolger, Nicolas Carr [ending]
- The title card font is the same along with its color as the one used for the episode "Komputer Overload."
- This episode marks the second time Plankton replaces Karen with another machine; in "Komputer Overload," Plankton blames Karen for his repeated failures to obtain the secret recipe and builds three machines to help him with that task.
- This episode marks the second time Karen works at the Krusty Krab. The first is in "Bucket Sweet Bucket."
- This episode marks the third time Karen has zapped Plankton. In "Enemy In-Law," after he's dumped by Betsy Krabs and tells her she "crawled back" to him, and once more in "Frozen Face-Off," she zaps him for leaving her nearly dead in the Frozen Tundra.
- This is the third episode in which Plankton replaces Karen with another love. The first is "Enemy In-Law" and the second is "Komputer Overload."
- This is one of the few episodes when Plankton plays a slightly big role in the episode, but isn't the main antagonist.
- In Comic Crazy: Take 2, there is a comic strip called "Krusty Karen" that shares a very similar plot where Karen leaves the Chum Bucket and works for the Krusty Krab. However, Karen 2 is not in that comic.
- When Karen is depressed because Plankton is cheating and she starts working, she does not ask for the Krabby Patty formula because she is mad at Plankton and doesn't want to help him.
- Plankton is controlling Karen 2, as shown in one scene.
- When Karen 2 says that Plankton didn't design her with hands, she seems to have hands when she disconnects Karen's hard drive. However, this is only one arm.
- Usually people push the Krusty Krab door open, but this time it's pulled.
- When Karen and Karen 2 argue, they use computer terms against each other. When Karen says she'll "crumble" Karen 2's cookies, it's an actual computer term; cookies are files that contain information about a user that are sent to the central computer with each request. The server uses the information to customize data sent back and to log the requests of the user.
- This episode premiered on March 24, 2013 in the British Isles after their local Kids' Choice Awards.
- This episode premiered in the British Isles three years after "Squidward in Clarinetland" premiered.
- This episode premiered eight years after Crime and Funishment was released, five years after "Friend or Foe" premiered, and one year after SpongeBob Comics No. 2 was released.
- This episode's working title is "Computer Trouble," making the name almost similar to "Komputer Overload."
- This episode was part of the "Two Whole Weeks of Never Before Seen SpongeBob" event.
- When SpongeBob and Mr. Krabs boot up Karen in Mr. Krabs' office, the screen reads "Karen Classic." This could be a parody of the Macintosh Classic, which is an Apple Macintosh computer from 1990.
- Karen 2 tells Plankton that she has no arms, but earlier she turns off Karen Classic with an arm that came out of a panel.
- Plankton goes and puts a battery inside Karen Classic. When he opens the battery hole, it has no battery inside. There should have been a battery inside, otherwise Karen Classic would not have been able to move before.