Las aventuras de Heidi comienzan cuando la niña es enviada a vivir con su abuelito, un viejo gruñón que vive en los Alpes suizos. Poco a poco, el anciano le va cogiendo cariño a su nieta, que vive innumerables aventuras con sus amigos, Pedro y Clara, el perro Niebla y la pequeña cabra Copito de Nieve.

Heidi after becoming an orphan is forced to live with her grandfather Öhi who lives in the mountain Alps. However he is a very bitter man who only accepts to take her in by force. Heidi's kindness may be able to open Öhi's heart. Along with Peter the goat carer and the crippled Klara, Heidi has a lot of adventures.