It was stated that the film would depict a teenage version of Dora who moves to the city to live with her cousin Diego.[3] The film was issued an August 2, 2019, release date.[4] In May 2018, Isabela Moner was cast to play Dora.[5] Eugenio Derbez began negotiations to join in June.[6] He was confirmed to appear in July, with Micke Moreno cast to play Diego, who would later be replaced by Jeffery Wahlberg.[7][8] Eva Longoria and Michael Peña were cast as Dora's parents.[9][10] Madeleine Madden also joined the cast of the film.[11] In October, Q'orianka Kilcher was added to the cast.[12] In November, Pia Miller was cast as Dora's aunt, Mami.[13] In December 2018, Benicio del Toro joined the cast as the voice of Swiper.[14] In March 2019, Danny Trejo announced that he joined the film as the voice of Boots the Monkey.[15]