Adam Sandler voices the eponymous septuagenarian tuatara, who fears he may be dying and thus reveals his talkative nature to his fifth-grade class's students when each, at the behest of their strict long-term substitute teacher (due to their main teacher's pregnancy), takes him home as a pet for the weekend to bond with them, with Leo's turtle friend Squirtle occasionally helping. Sandler's daughters Sunny and Sadie also voice two of the fifth-graders. It's basically a (mostly) family-friendly musical comedy, with occasional Aesops in the mix and character transformation (in terms of nature, not physical form). It has some decent laughs but is more or less on par with Sandler's prior films.