Duck feathers were used by the CGI crew to create Angela's wings.
Since they are result of IVF, the designation "mutants" given to the super-powered beings in this show is incorrect, as mutations (DNA alterations) occur naturally. In real life they would rather be classified as transgenic beings or genetically modified organisms (GMO).
Fernanda Montenegro was offered and came very close to accept the main role of Dr. Julia. She declined after considering that the show would target a young audience. Ítala Nandi, who was set to portray Ana Luz, took over the role.
Ítala Nandi previously portrayed a scientist that studied transgenic beings in Tiago Santiago's play "DNA - Nossa Comédia". She visited real life labs in preparation for her role in this series and died her hair blond on Santiago's request.
Actor Lance Henriksen was cast on the weight of his popularity in sci fi productions such as Aliens (1986) and Millennium (1996).