
Once the Minions arrive in New York City, he wears different costumes to see which one the minions should wear. And halfway through, Stuart becomes so hungry that a hallucination begins, and he attempts to lick Kevin, but Kevin spanks him several times. Bob is then picked after him, and they all head out to find a new master. Stuart, though not paying attention to Kevin's speech, agrees to join despite not knowing anything about what's coming ahead. Stuart was the first minion picked by Kevin to help join him on his quest to gain a new master.

He appears during the credits promoting the spin-off movie, Minions, along with his friends Kevin and Bob. In the end, Stuart, along with his friends Dave, Kevin, and Jerry, are dressed in white, singing " I Swear" at Gru and Lucy's wedding. However, the plan fails due to Dave accidentally ruining his own disguise by attempting to communicate with the Evil Minions and part of his paint vanishes. Gru disguises Stuart and Dave in purple paint to pass them off as Evil Minions escorting a seemingly captured Gru into El Macho's lair in a rescue attempt. Nefario tells Gru that Eduardo has kidnapped Lucy, Gru forcibly grabs both Stuart and Dave – who are at the middle of a video game – to follow him to rescue Lucy. It is possible that Stuart is the minion Gru was practicing with, when he tried to ask Lucy out on a date (Although Gru stated that the Minion's not helping). Lucy opens the car door and is greeted by Dave and Stuart (who seems to have a crush on her as well, as shown when Stuart pushes the accelerator). When Dave gets the call from Gru to rescue him and Lucy, Dave acts right away, crashing through the malls entrance with Stuart on the gas pedal, Dave and Stuart failed to pull over for Gru and Lucy twice, but saved them in time before Eduardo caught them. When Gru and Lucy are investigating Eduardo's restaurant Salsa & Salsa, Stuart is waiting by the car outside together with Dave. Stuart is later shown with the rest of the Minions having an ice cream party when Gru arrives and asks him and Dave to come with him then the party resumes and immediately stops. Stuart disguises himself as a girl, though his dress gets ripped (revealing his pink knickers which came with the disguise), which forces him to hide in a flower pot out of embarrassment. Stuart is present along with Dave when Gru works undercover as the owner of a cupcake shop in the Paradise Mall. Stuart and Phil both make fun of the AVL's director, Silas Ramsbottom, because the last part of his last name has the word "bottom", a word that Minions love to have fun with. The duo chases after Lucy's car, causing minor havoc in the process, and they end up following her to the AVL after being abducted by her. Stuart and Phil are cleaning up from Agnes' party when they see Gru being abducted by Lucy. Stuart is also seen laughing at butts with Tom and Jorge. He is also seen moaning and cheering (when heard that it's not for them) when Gru talks briefly about bedtime. Ultimately, he ends up playing with the girls, throwing toilet paper around in the living room. Stuart and Jerry are asked by Gru to watch Margo, Edith, and Agnes, and keep them away from him. Also, he was said to be always hungry in Minions, such as when he attempted to eat Kevin and Bob when he was thinking of them as bananas, and even tried to sing a yellow fire hydrant in New York, thinking that it was a female minion. He is considered to be a slacker among the other Minions, preferring to chill out and play the ukulele than listen to the rules. He also seems to have a rebellious and obstreperous attitude. He can also be the most sincere and innocent out of all the minions. He is skillful at video games like his friend Dave.

Stuart is playful, friendly, intelligent and funny. In Despicable Me 2, he is seen dressed up as a girl after Gru is recruited by the Anti-Villain League and sent to Bake My Day to investigate. Stuart is a one-eyed short Minion with combed hair.
