Once Upon a Nickelodeon is a 2024 Live-Action/Animated film released on May 2, 2024
Plot[]
right after the people that work at Nickelodeon studios go home, leaving the studio empty... and then a portrait of SpongeBob SquarePants, Sandy Cheeks and Mr. Krabs comes to life. And since Nickelodeon is well known for their slime, Nick hops out of one of the props from the famous Nickelodeon game show, Double Dare, specifically the Pick It nose. Jenny Wakeman/XJ8 from "My Life Is a Teenage Robot", Especially Cat and dog from "Cat dog" and Harvey from "Harvey Beaks" tells Everyone Its Picture Time
Mr. Krabs Says Hurry Up You Two SpongeBob Says Its Picture Time Dora Jumps out of her picture and Boots Jump out of his picture Dora Says Wake Up Vamono's Amigos (Blue Sings Blue Skidoo We Can Too) Blue Skidoo Out of The Picture Shovel, Pail, Mr. Salt Mrs. Pepper, Paprika, Cinnamon, Slippery, and Tickety Tock. Jumps out of the picture.
Sandy Tells Ryder Gets the Folks Upstairs Norbert and Dragget from "The Angry Beavers"
rolling out of control on a runaway roller coaster kart, while dragging June
Jimmy Neutron and his dog Goddard (who tecnically came from a much more successful Nickelodeon movie) fly past on the Strato XL rocket while pulling Donnie Thornberry from "The Wild Thornberrys" on a rope, as Jimmy Neutron shouts his catchphrase (through archival dialogue) "Gotta blast!"
After the hallway cleared, Mighty Mouse himself makes a grand comeback as he shouts HIS catchphrase "🎵Here I come to save the day! 🎵"
Diego Marquez and baby Jaguar from "Go Diego Go" are sliding down the stairs bainsters Angelica Drives a Cynthia Car with Gordon Quid from "Cat Scratch" and Susie Carmichael as her passenger's sky whale While Sid Chang in his flippers
Katara from "Avatar the Lost Air Bender" drops Molly, Gill, Nonny, Goby, Oona, and Deema from "Bubble Guppies" and Gill Says "Water!" Katara Says "WHAT!"
Keswick Kyle Butterbean cricket dazzle and poppy Stu pickles to get help someone from bubble guppies with his magic
While This Happens, the four Teenage Mutant Ninja Turtles Walk by look at their expressions as the whiteness Zim's Anger attack, Ralph is Concerned, Mikey is surprised, Donnie is shocked, and Leo is Confused, Michaelangelo said, "If All Villain's Will Show Up!" Leonardo said, "Not All!"
Squidward from "SpongeBob SquarePants" Otis from "Barnyard" Alica Marquez from "Go Diego Go" Hiro Mighty paw from "Monkey Quest" Angus and Morag from "The Loud House Movie" only to be stuck waiting for Linny, Tuck, Ming Ming, and Ollie from "The Wonder Pets", Linny Said, "Wait Hold the Elevator!" and Squidward Says What? Rage, Furry, Irritation, and Humiliation.
Lincoln Loud and his friends (Clyde McBride, Stella Zhau, Rusty Spokes, Laim Hunnicutt and Zach Gurtle) in an animater's room that happens after Sam Manson from "Danny Fantom" told them "Shake a Leg" Lincoln is sketching at the plate of Lynn-Sagna beside it, guess who's going to bust out this picture.
Lincoln Load is Not Alone with his friends Clyde McBride, Rusty Spokes, Laim Hunnicut, Zach Gurdle and Stella Jim Davis,
Garfield bursts out of a drawing Lincoln was Sketching... Only to steal the plate of Lynn-Sagna next to the boy.
Teen Nick and Nick Jr boys (and men) Are Getting ready. 
Omblina, Krumm from "AHH! Real Monsters" Trying to get Icklis unstuck from his picture frame In This Happens, Eliza Thornberry from "The Wild Thornberry's" Abner from "Hey Arnold!" Spunky from "Rocko's Modern Life" Bo Monkey from "The Fresh Beat Band of Spies" and Fiesta Trio from "Dora the Explorer" Who Confirm her that they're meeting at the lobby only stop once they see something very concerning, which prompts Eliza Says, "Don't Eat Those!"
Bossy Bear and Turtle Are Both Each Other in Fear but then, SpongeBob's Pet Snail Gary, Pops Out of Nowhere and roars at the four goofballs, scaring them away while Bossy Bear and Turtle congratulate Gary. Turtle Evan Gives the Snail a friendly pat on his head and give him a thump's up. 
Dudley Puppy from "T.U.F. F Puppy" walks (Along with Kitty Kat swell and a small number of past Kai-Lan, Rintoo, Tolee, Hoho, and Lulu from "Ni Hao-Kai Lan",
who are watching the 2016/2017 Nickelodeon Movie "Monster Trucks" on a TV.
after all the various gags that happened in the studios building, Lenny, Tuck, Ming Ming, and Ollie. finally, managed, to get to the elevator. all the characters inside it relieved Heffer Woolfe from "Rocko's Modern Life" Arrives narrow elevator as squid ward screams in what Can I Describe as a mix between rage, fury, irritation and humiliation. Ming Ming Says, "Thank You All, Fow Howding...the Ewe Vatah!" Squidward Says "What Ever!" Heffer Woffle Says "I'm also going to the lobby!"
SpongeBob Arrives and then Laughs until he hears a familiar Whisking Sound Swiper From "Dora the Explorer" Mrs. Puff From "SpongeBob SquarePants" Wearing an Elegant Dress from The Best Day Ever Mrs. Puff Says Swiper no Swiping! Swiper no Swiping! Swiper No Swiping! Swiper No Swiping Swiper No Swiping SpongeBob "Says Stop You Thief!" Grandma Gertie from "Hey Arnold" Says "Don't Worry SpongeBob I Got This!" Swiper Yelled OUCH!!! (Feels Dizzy and Sees Stars) Swiper Says Ohhhh, Maaan (Snaps His Figures while Going Dizzy) 
Then, SpongeBob sees something that surprises him at first, and then smiles: it's the portrait of his late creator, Stephan Hillenberg. He Takes His Hat off in Respect as "Aloha Oe" plays in the background*
Mr. Krabs Says SpongeBob "Where Are You Boyo!"
Sandy "Says We're At the lobby!"
SpongeBob Walks away he says on with the show
Depicting Various Nickelodeon and Nick Jr Characters Near the Staircase That Leads to the lobby and SpongeBob Gets a Little Help from Danny Phantom to get to the main entrance.
This Time, after Nate Wate from "Big Nate" told SpongeBob the Coast is Clear, the yellow sponge lead the characters way...and then toph Beifong From "Avatar the Lost Airbender" walks right the door. and after that, Ran Hoek from "The Ren and Stimpy Show" arrives, but instead of saying that he's "Surrounded" by those Idiots", he thought he outright calls toph an "eediot"... Only for Him to get Ran Over by Sway away and Buhdeuce from "The Breadwinners" who are joyriding an out-of-control Umi Car from "Team Umizoomi"
Sway Sway and Buhdeuce from "Breadwinners" riding around the nickelodeon animation studios building on an out-of-control Umi Car from "Tean Umizoomi", Who later brakes hastily, sending the two ducks flying who knows where. 
after Patrick star placed the ladder, the cast of the 2021 puppet show, the barbarian shows and the troll (Brender, Evan, Horus, Scrum, and Stacy Owl.), Walks by as Cosmo, Wanda and Poof. from "The Fairly Odd parents" Poofs into View. 
Faces in the back with the same out of fear and worry SpongeBob Has.  and SpongeBob Says Patrick Careful
Azula counts the seconds before Patrick falls of the ladder, with Vicky from "The Fairly Odd parents" by her side, finding the whole thing amusing, while everyone else is quite distressed. 
depicting serval characters sadden (and some Irri tend) that Patrick star destroyed the camera that was supposed to take the picture out of the clumsiness. 
Patrick destroys the camera. Some out of sadness, some out annoyance and some out of anger. 
They all Start Playing "When You Wish Upon a Star" Tito Makani from "Rocket Power" plays his Ukulele Lori Loud from "The Loud House" is Playing a Trumpet Sven Hook from "The Ren and Stimpy Show" Plays the Accordion Ansi Molina from "Welcome to the Wayne" and Magenta from "Blues Clues"
Musical big Number starts to which from "The Legend of Korra" Says "I Knew This Was Gona Happened". 
Specially in the "No Request is Too Extreme" part, which was originally sung by Waffle from "Cat Scratch" to a number of Nickelodeon and Nick Jr (and acquiring Nickelodeon Stuff)  Animals, Including...One of His newts
Glitch Sings Teches, While the teaches Fan boy and Chum Chum Song in Verse
being nice for once, by lifting Patrick in the air so he can set the camera on the ladder. 
Singing With the Three main characters
Dora to used Nick Jr's flagship Show, but now it's Paw Patrol
Once Upon a Nickelodeon/Characters
Once Upon a Nickelodeon/Transcript
Once Upon a Nickelodeon/Gallery
Once Upon a Nickelodeon/Trivia
It Aired on May 2, 2024, based on Disney's Once Upon a Studio