Griffin "The Brains" Bing (Noah Crawford) is a teenage boy known for helping out his friends in times of need. His friend Ben "The Best Friend" Dupree (Chris O'Neal) and his family are in the danger of losing their home. The boys find a Honus Wagner baseball card inside Ben's house. Without realizing its actual worth, they decide to sell it to Paul Swindell (Fred Ewanuick), a collector who agrees to buy the card for $350.00.
The next morning, Griffin and Ben discover that Swindell has claimed to have found the card himself and plans to sell it for $1.2 million. The two meet Swindell, who refuses to return the card. Griffin forms a team in order to perform a challenging heist. Besides Griffin and Ben, the team consists of Amanda "The Gymnast" Benson (Ariana Grande), Savannah "The Actress" Westcott (Jennette McCurdy), and Darren "The Muscle" Vader (Noah Munck). Griffin's younger sister Melissa (Ciara Bravo) attempts to join the team but Griffin rejects her.
Together the team attempts to sneak into Swindell's shop. Griffin finds the card but is worried that they would be potential suspects in an investigation of the card. After Melissa saves the team from being caught by hacking into the shop's alarm system, they let her join the team and dub her "The Hacker." Griffin then plans to have Swindell hand over the card to them. Subsequently, Anton Lefevre, a wealthy businessman, invites Swindell to auction off the card to him.
Using video camera glasses with an ear piece, Amanda goes to the house of Eddie, a nerdy rare item collector to find a rare red-headed Captain Cybertor action figure. He lends the toy to her in return for a date with him. The team plans to get the card at the Lakeshore Hotel where Swindell is planning to sell it. Melissa hacks into the system and switches the rooms. Their room is a crown suite, but Swindell's is a basement hotel room. Savannah then pretends to be Swindell's daughter and asks for the hotel room key to the crown suite. Savannah and Darren pretend to be a couple of German kids who do not know the action figure's actual price and sell it to Swindell for $10. Swindell then goes to a massage with Griffin, who is disguised as Lefevre. During the massage, Griffin receives a phone call from a collector named Ivan Volkov who has been searching for a red-headed Captain Cybertor.
Swindell retrieves the rare red figure, but Amanda has swapped it for a normal blue one. He sells it to Volkov for $80,000 and later sees through Ben's mustache disguise, finds Ben's room card, and enters the gang's room. The gang confronts Swindell and tells him about the Cybertor switch. They offer him the red Cybertor in return for the Honus Wagner card and show him CCTV footage of Volkov furious at Swindell for giving him the blue one. Swindell lunges for the red toy so they throw it around until Ben accidentally throws it off the balcony and on to a couple's wedding cake. They all chase after it. Meanwhile, Ben's dad is at the hotel and is showing off his invention called the iGotit, hoping to win a cash prize.
After disrupting the wedding, the gang retrieves the Cybertor and offer it to Swindell in exchange for the card in order to give it to Ivan Volkov. After Swindell gives the Cybertor to Volkov and flees under his orders, it is revealed that Ivan Volkov is actually Savannah's father who alongside two other men were enlisted by Savannah to help Griffin out. The gang celebrates and reveals themselves as the actual owners of the card to Lefevre who invites them to the auction for it as the auction was near where Swindell was confronted. When Swindell attempts to leave the hotel, he bumps into an employee who spills his case and reveals a load of fake Honus Wagner cards with Swindell's face on them. A hotel employee gives Swindle the $35,000 bill for The Crown Suite as Swindell shouts Griffin's name into the sky.
At the end, Griffin rewards the gang with $25,000 for their help. Ben explains his family did not need the money because his dad had earned money off of his invention. They also used the money to send the wedding couple on a real honeymoon. Ben also pays for the group's college and lets himself and his team spend the rest. Afterwards, Griffin decides that the rest of his money that he has to pay to have the group continue to foil swindlers after a little girl asks for Griffin's help getting her rare bird back from a fake groomer.
- The 100 Acre Avatar League, Ash Ketchum, Pikachu, Misty, Togepi, Brock, Littlefoot, Cera, Ducky, Petrie, Spike, Chomper, Ruby, Guido, Grandpa Longneck, Grandma Longneck, Genie, Simba, Nala, Timon, Pumbaa, Sora, Riku, Kairi, Mickey Mouse, Donald Duck, Goofy, Pluto, The Mighty Morphin Power Rangers, SpongeBob SquarePants, Patrick Star, Squidward Tentacles, Sandy Cheeks, Eugene Krabs, The DigiDestined and their Digimon, Harry Potter, Ronald Weasley, Hermione Granger, Harley Diaz, Rachel Diaz, Ethan Diaz, Daphne Diaz, Georgie Diaz, Lewie Diaz, Beast Diaz, Scooby-Doo, Shaggy Rogers, Fred Jones, Daphne Blake, Velma Dinkley, Tino Tonitini, Lor McQuarrie, Carver René Descartes, Tish Katsufrakis, Sunset Shimmer, Sci-Twi, Spike the Dog, Jinoo, Princess Sherbet, The Bowser Family, Master Xehanort, Psycho Rangers, Dr. Facilier, Sheldon J. Plankton, The Grand Duke of Owls, Pete, Scar, Shenzi, Banzai, Ed, Lord Voldemort, Judge Doom, Megan, Nora Beady, Foop, Vicky, Denzel Crocker, The Dazzlings, The Crime Empire (Joker, Harley Quinn, Two-Face, Penguin, Negaduck, Megavolt, Quackerjack, Bushroot, and The Liquidator), and Team Rocket will guest star appearances in this film.
- The Bowser Family, Master Xehanort, Psycho Rangers, Dr. Facilier, Sheldon J. Plankton, The Grand Duke of Owls, Pete, Scar, Shenzi, Banzai, Ed, Lord Voldemort, Judge Doom, Megan, Nora Beady, Foop, Vicky, Denzel Crocker, The Dazzlings, The Crime Empire, and Team Rocket will work for Paul Swindell.
- SpongeBob SquarePants, The Fairly OddParents, Barnyard, Back at the Barnyard, The Legend of Korra, The Loud House and Swindle are all made by Nickelodeon.
- This film will reveal that Griffin is Timmy Turner's long lost older cousin.
- This film take places after Pooh's Adventures of The Toy Warrior (Witch explains that Pooh, Simba, Sora, Mickey and Spongebob and their friends already know Jinoo and Princess Sherbet), Weekenders Adventures of The Toy Warrior (Witch explains that Tino, Ash, Littlefoot and their friends already know Jinoo and Princess Sherbet), Pooh's Adventures of Cowman: The Uddered Avenger (Witch explains that Otis and his friends already face Dr. Facilier before), Pooh's Adventures of LEGO Friends: Girlz 4 Life (which explains that Pooh and his friends already faced Megan before), Weekenders Adventures of LEGO Friends: Girlz 4 Life (Witch explains Tino, Ash and their friends already know Megan), Pooh's Adventures of Teen Titans: The End (Full Movie) and Otis' Adventures of The SpongeBob SquarePants Movie (Which explains that Otis and his friends already know SpongeBob and his friends and face Sheldon J. Plankton before), Winnie the Pooh Goes to Barnyard: The Original Party Animals (Which explains that Pooh and his friends already know Otis and his friends and Otis and his friends already face The Crime Empire before), Winnie the Pooh goes Back at the Barnyard (Which explains that Pooh and his friends already know Abby and faced Nora Beady before) and Pooh's Adventures of Pup Star (Witch explains that Abby already face The Crime Empire before).
- The DigiDestined and their Digimon will meet Jinoo and Princess Sherbet of the first time.
- Harley and her family, Jinoo and Princess Sherbet will meet Harry Potter, Ronald Weasley and Hermione Granger for the first time.