Duke Caboom was one of the more successful new characters in Toy Story 4, but the faulty toy actually made is debut in Incredibles 2. Voiced by Keanu Reeves, Duke is a Canadian stuntman toy inspired by such real-life figures as Evel Knievel. He was also fully animated by a team of real-life fellow Canadians who volunteered for the task. Despite opening to less than expected at the box office, the latest Toy Story film has been widely well-received, and Duke is at the fore of that praise.
The story follows Andy's former toys as they enjoy a live of contentment with their new owner, Bonnie. With the youngster anxious about starting Kindergarten, Woody (Tom Hanks) attempts to comfort her by giving her the materials to make a figure called Forky. To Woody's surprise, Forky comes to life when Bonnie puts him out of sight in her backpack. Voiced by Tony Hale (Arrested Development) and facing an existential crisis, Woody once again takes it upon himself to Forky and guide him through his new reality. The subsequent road trip leads the gang to once again cross paths with long-lost friends like Bo Peep. It also brings them in contact with new allies like Duke Caboom.
Toy Story 4 is packed with Easter eggs across all of Pixar's history, although these references go both ways. It turns out, Duke Caboom was in Incredibles 2! Seen briefly during a scene in the Parr's household, Duke Caboom can be seen clearly laying on the floor of Jack-Jack's crib. He's also surprisingly in a very pristine condition, given Jack-Jack's proclivities for super-powered outbursts. As such, he appears to be a beloved toy of the youngster.
Duke Caboom makes his debut on the Toy Story franchise as part of Bo Peep's new group of friends at the Antique Store. Though known for his showboating tendencies, the characters suffers from a complex of guilt for not living up to his previous owner's expectations. Thankfully, the character is able to overcome them at crucial junctures in order to help out the established gang of toys and keep Forky safe on Bonnie's behalf. The reveal regarding his Incredibles 2 appearance certainly poses potential questions and leaves the door open to fervent speculation.
Fans have long wondered just how interconnected the Pixar universe is. This could be a further hint that the answer is "very." At the very least, it's fuel for theories about how wide-spread the Duke Caboom toys were. His inhabiting the Antique Store implies he's older than the likes of Buzz Lightyear, and with the Incredibles movies set in the 1960s, it's conceivable Jack-Jack got one from a similar run to the version in Toy Story 4.
This isn't the only major universe connection in Toy Story 4, with an older version of Boo from Monsters, Inc. believed to have been in Bonnie's Kindergarten class and at the fairground. Even nearly twenty movies in, Pixar is still finding ways to surprise.