"Grandmum's the Word" is a SpongeBob SquarePants episode from season eleven. In this episode, Plankton tells his grandma that he owns the Krusty Krab, but must keep the lie going when she comes to visit.
The episode starts off with Plankton pampering Karen and giving her a mud bath. As Plankton and Karen are about to kiss, Karen's screen turns off and is replaced with a call from Plankton's grandmother. It turns out that Plankton promised to own the Krusty Krab by her 90th birthday, and her birthday is tomorrow and she is coming to visit the Krusty Krab. Because of this, Plankton has to lie and keep the lie going when she visits. Plankton explains to SpongeBob and Mr. Krabs the situation, and after explaining it in a sincere way, SpongeBob and Mr. Krabs agree to give the Krusty Krab a Plankton-themed makeover.
The next day, Plankton's grandma visits the now-Plankton-themed Krusty Krab to take a look. While Plankton is trying to force SpongeBob, Mr. Krabs, and Squidward into the scheme, Grandma Plankton starts to develop a crush on Squidward. Grandma Plankton introduces herself as Lily and wants to have a Plankton Patty, so SpongeBob makes on for Lily and forces Squidward to chew it for her.
The scheme finally works out until Lily wants a picture with the Secret Formula. Plankton does his sincere face and Mr. Krabs hands over Lily the formula. As they start to take a picture, Lily flies away with a jetpack. Mr. Krabs gets angry at Plankton for creating a plan to steal the formula, but Plankton didn't knew a thing about this; however Plankton thinking he won, thinks he can rule the fast food industry with Grandma, but Lily states she's not sharing the formula and drops Plankton and flies away to the retirement home.
Finally winning, Lily daydreams her idea of forcing Squidward to be her ally while the other citizens (including Plankton) has to fight over the patties Lily throws. However, before she can open the bottle, Lily goes to sleep, so Mr. Krabs get the formula back and Plankton gives Lily prune juice, wishing Lily happy birthday, ending the episode after Lily slaps Plankton with her purse.
The episode was confirmed by Vincent Waller on November 12, 2017.
‣ Earl's Revenge
|( ‣ ) Associated production music|
|( • ) Original music|
|( ◦ ) SpongeBob music|
- Sage Guyton, Jeremy Wakefield [Title card]
‣ Esta Noche (a) - Hans Ehrlinger [Plankton pampering Karen.]
‣ Nude Sting - Nicolas Carr ["Grandma?!"]
‣ Lite Conversation - Nicolas Carr, Barry Anthony [Plankton's grandma talks to Plankton.]
‣ Drama Link (b) - Hubert Clifford [Plankton thinks about lying to his grandma.]
‣ Lite Conversation - Nicolas Carr, Barry Anthony [Plankton claims to his grandma he owns the Krusty Krab.]
‣ Esta Noche (a) - Hans Ehrlinger ["Now bring back Ray-Ray."]
• Hot Steel and Slide Licks (h) - Jeremy Wakefield ["What am I gonna do, Karen?"]
‣ Cartoon Sting 5 - Karen kicks Plankton out of the Chum Bucket.
‣ Jovial Pirates Jig - Michael Bolger, Nicolas Carr [SpongeBob playing with the signal of the Krusty Krab.]
• Hot Steel and Slide Licks (o) - Jeremy Wakefield ["SpongeBoob, you gotta help me!"]
‣ Cartoon Sting 7 - Plankton explains his situation to SpongeBob.
‣ Hot Steel and Slide Licks (z) - Jeremy Wakefield [One pathetic sob story later...]
‣ Tabu - Daryl Griffith [Plankton's sincere face.]
‣ Lap Steel - Nicolas Carr [SpongeBob gets happy.]
‣ Sailor's Sting 12 - Michael Bolger, Nicolas Carr [Krabs swallows the Krabby Patty secret formula.]
‣ Hot Steel and Slide Licks (XIII) - Jeremy Wakefield ["Pronto!"]
‣ You're Nice - Sage Guyton, Jeremy Wakefield [SpongeBob and Squidward modifying the Krusty Krab for Plankton's grandma.]
‣ Stupid Cupid - Ronald Hanmer [Plankton's grandma arrives at the Krusty Plankton.]
• Hot Steel and Slide Licks (m) - Jeremy Wakefield [Squidward sleeping.]
‣ Co Co Baby (a) - Gil Flat [Plankton's grandma falls in love with Squidward.]
• Hot Steel and Slide Licks (d) - Jeremy Wakefield ["Alright, lady, I don't normally say this, but get off my nose."]
‣ Pepito from Tampico (a) - Otto Sieben, Ronald Sekura ["So, Grandma Plankton, where have you been all my life?"]
‣ Kitsch Comedy - Peter Jeffries [Grandma Plankton at the kitchen.]
‣ Hot Steel and Slide Licks - Jeremy Wakefield [SpongeBob, Krabs, Squidward and Plankton juck.]
‣ Cartoon Sting 4 - "You really are a master chef."
‣ Fooling Around - Barry Anthony [Plankton's grandma wants a photo of her with the secret formula.]
‣ Tabu - Daryl Griffith [Plankton shows his sincere face to Mr. Krabs again.]
‣ Fooling Around - Barry Anthony ["Fine."]
‣ Target - Hans Ehrlinger [Plankton's grandma takes off with the secret formula.]
‣ Epic Struggle - Fredric Bayco ["Why? Why did I lie?"]
• Hot Steel and Slide Licks (b) - Jeremy Wakefield [Grandma Plankton returns to Shady Shoals with the secret formula.]
‣ ? [Grandma Plankton's world domination daydream.]
‣ Aloha Lui Lui - Nicolas Carr, Sage Guyton, Jeremy Wakefield [The ending]
|| I can turn into a skyscraper!
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- As of April 1, 2018, The Internet Movie Database (IMDB) gives this episode a rating of 9.1/10 based on 7 ratings by users. TV.com users give this episode a rating of 8.0/10 based on 1 votes.
- The title is a play on the English idiom "mum's the word," an indication that something is to be kept a secret.
- In "Gramma's Secret Recipe," Lily has two eyes. However, she only has one eye in this episode.
- On the Galley Grub sign, "Krabby Patty" is misspelled as "Krabby Pattie."
- During the scene with all of the Bikini Bottomites groveling to Lily, red numbers appear on the screen for a second.
- Also during that scene, Mr. Krabs' eyelashes are missing.
- Plankton making his sincere face
- Lily smacking people with her purse
- Lily flirting with Squidward her blindness