The film, "not a musical film" but featuring "a lot of music" according to Paco León,[1] follows the coming-of-age story of a teenager with an extraordinary musical talent (Dora) leaving home alongside her dog Toto upon a quarrel with her father Diego, embarking on a journey to 'Ciudad Capital'.[2][3][4]
Rainbow is inspired on L. Frank Baum's The Wonderful Wizard of Oz.[10]Paco León co-wrote the screenplay alongside Javier Gullón,[11] and is also credited as producer.[12] Produced by Telecinco Cinema in collaboration with Los amigos de Dorothy AIE, and the participation of Andy Joke and Colosé Producciones,[10] filming began on 2 August 2021.[13] Shooting locations included the Madrid region and the provinces of Segovia, Guadalajara, Toledo and Alicante.[14][15] Netflix reported the wrap in October 2021.[16] Other crew duties were entrusted to Marc Miró (cinematography), and Ana Álvarez-Ossorio (editing), whereas Diego Postigo helmed the coordination of the musical production.[17]
Fernando Bernal of Cinemanía rated the film 1 out of 5 stars, writing that León's "road movie never manages to pick up speed" and its sequences "falter within their own rhythm".[22]
Elsa Fernández-Santos of El País wrote about a film "capable of both the best and the worst", featuring an awry catharsis somewhat amended by a beautiful epilogue, resulting into an "uneven and largely botched film", even if having the courage to look to the future".[23]
Raquel Hernández Luján of HobbyConsolas scored 40 out of 100 points ("bad"), deeming it to be an "immature and pretentious" proposal, with "clumsy" metaphors, and a final party that ends up becoming "irritating".[24]
John Serba of Decider.com considered that the film "boasts enough compelling and creative pieces and parts to merit a recommendation, even if they don't quite come together as a whole".[25]