Anteojito and Antifaz, A Thousand Attempts and One Invention(1972)

Original title: Anteojito y Antifaz, mil intentos y un invento

Anteojito and Antifaz live in an apartment house in Villa Trompeta, a fantasy city with funny animals, dancing vegetables, and Uncle Antifaz’s enemy, Cachavacha the witch, living with Pajarraco her owl, in the apartment right under his. Uncle Antifaz tries to invent an invisibility formula with Anteojito’s help, and Cachavacha tries to steal it.