The actor voices a curmudgeonly class pet in this Netflix coming-of-age musical about fifth-graders facing their last year of middle school.

The lessons in Netflix’s new animated coming-of-age musical Leo might be clichéd, but they are presented with enough heart to turn even the most cynical viewers into fans of the titular reptile. 

All of that shifts when Leo overhears an adult during parent-teacher conferences remarking on his age. According to the bespectacled gentlemen, the lizard looks like he’s nearing the end of his life. The conversation shocks Leo, who becomes obsessed with making the most of what is surely his last year. He endeavors to be free, to see the world (or, realistically, more of Florida, where the animated feature is set) and find purpose beyond being a class pet. 

The new school year opens with a song and an announcement. An ensemble tune about the last year of elementary school ends with the realization that Ms. Salinas (Allison Strong), a beloved teacher, is pregnant. The news devastates her students and their guardians, who have historically hated the school’s substitute teachers. “I’m texting my daughter right now,” says one enraged parent (Jason Alexander) who uses his donations to exercise power over the administration. “She’ll be devastated.” His daughter, Jayda (Sadie Sandler), is less than crushed. She and her classmates proceed to scheme different ways to make the unknowing substitute miserable. 

Their plans don’t succeed. Replacing Ms. Salinas is Ms. Malkin (Cecily Strong), a cantankerous and tough woman who believes in the power of demerits over stars. She institutes dramatic changes to the classroom, including a rule that forces one student to take home a class pet each weekend. The students bristle at this idea until they realize that Leo isn’t just an ordinary lizard, but a talking one. 

Summer (Sunny Sandler), a chatty fifth grader with a tendency to bore people with her monologues, figures it out first. She unwittingly intercepts Leo’s attempt to escape out of her bedroom window (the lizard is trying to see the world, after all) and in the process flings him into her wall. “Mother of Godzilla,” Leo shrieks, prompting Summer to inquire about the source of that noise. 

Most of Leo proceeds in a similar after-school-special manner. Each week, a different kid takes the lizard home and he, after convincing them that no one else can hear him, offers to listen to their problems. These vignettes effectively satirize modern parenthood and showcase the range of Leo’s counsel. Sandler does characteristically great voice work, giving Leo a curmudgeonly personality founded on real sensitivity. (He’s like a geriatric Count Dracula from Hotel Transylvania.) The more advice Leo gives to the kids, the more purpose he finds in his life. He channels his worries about dying into helping these students — who don’t feel seen and heard by their parents — live.

Each lesson in the film speaks to the stresses of modern parenting, and in that way Leo might be one of those kids movies that’s better suited for adults. Most of these 10-year-olds are unhappy because their material abundance — gadgets, toys, etc. — can’t replace the gift of being understood. There are occasions when the film drags as it attempts to flip back and forth between addressing kids and adults, but most of Leo moves nimbly.

The animation work in Leo is solid (it’s similar to Apple TV+’s Luck) and the music (by Smigel, while Geoff Zanelli composed the score) is more winking theatricality than memorable rhymes. It’s the narrative and Sandler’s comedic timing that will keep you watching. The actor is joined by his daughters here, who contribute fine voice work (Leo, like Netflix’s You Are So Not Invited to My Bat Mitzvah, feels like a family affair): Sadie and Sunny Sandler play Jayda and Summer, respectively, two girls on opposite sides of the popularity spectrum, who share more than they realize.