Some franchises have such longevity because they revitalize themselves every decade, bringing the concept into a then-modern setting that allows them to be different from before and add something new to enjoy. Teenage Mutant Ninja Turtles is one such franchise, specifically their animated adaptations. From the late 80's/90's series to the 2003 and 2012 versions, the past three decades have had their own Turtles kids could grow up with; and even if you've watched all three, you can see how each have their merits that any could be someone's favorite. The 2020's begin the cycle again with the film "Mutant Mayhem". In addition to being declared the best TMNT film by a wide margin (and I totally agree with the sentiment), we can bid welcome to the Turtles for a new generation that can also be enjoyed by the older ones.
A good way to look at "Mutant Mayhem" is kind of like a "Year One" story. While we see the Turtles here trained in martial arts and their iconic weapons, it takes them awhile to get in the groove of battle since they've been sheltered their whole lives and never been in a real fight. This plays well with the big draw the film has compared to past adaptations, that being more emphasis on the "Teenage" part of the title than ever before. In addition to giving the Turtles real teenage problems like dealing with an overbearing parent and trying to find their place in the world, actual teenagers voice the characters for the first time ever. The cast recorded their lines together and would improvise things that made it into the film, giving the brothers such natural dialogue and feel like their age. It even makes the pop culture references not feel so forced; they're teenagers in 2023, of course they'd be making these references.
Joining these fresh faces is a good cast of established actors who bring just as much fun to the film, including Paul Rudd as Mondo Gecko, Rose Byrne as Leatherhead, Natasia Demetriou as Wingnut, and Jackie Chan as Splinter. Ayo Edebiri and Ice Cube also do well as April and main villain Superfly, respectively. April fits right in with the Turtles while Superfly initially gives them a sense of belonging before he goes full Magneto.
"Mutant Mayhem" uses the same animation style as the "Spider-Verse" films, which naturally ensures some dynamic action scenes. To help it stand out though, I notice they give it a gritty and scratchy style that evokes the original TMNT comics. There's even some nice artistic choices of including stray pencil/marker lines and painted looking backgrounds. And while it's in 3D, there were times where the movement and character designs kind of reminded of stop motion films, with "ParaNorman" the one most springing to mind.
Without going into spoilers, this film takes the Turtles in a very different direction some may be used to. But like I said, new interpretations need to do something different from before while still maintaining the spirit of the franchise. "Mutant Mayhem" does that and Paramount and Nickelodeon are going all in with this version; along with a sequel being greenlit, an animated series and video game are also in the works. All in all, it's a safe bet that the Turtles have a bright future ahead of them.