In 1989, Castro received a scholarship from the Government of France to perfect himself in theater directing in Paris, Strasbourg and Lyon.

For the theater of the Catholic University, Castro staged the plays Theo and Vicente mown by the sun (adaptation of Nous, Theo et Vincent Van Gogh, by Jean Menaud; 1990) and King Lear, with a translation by Nicanor Parra; and in Chile, La Catedral de la Luz (1995), by Pablo Álvarez and Casa de Luna (1997) by Juan Claudio Burgos Droguett, a work inspired by the novel El lugar sinlimites, by José Donoso.

During that same season, he staged Hechos consumados by Juan Radrigán and Patas de perro, based on the homonymous novel by Carlos Droguett.

Castro joined Televisión Nacional de Chile in 1998, collaborated closely with director Vicente Sabatini, with several performances in the Golden Age of TV series, achieving great popularity with his roles in La Fiera, Romané, Pampa Ilusión, El Circo de las Montini, Los Pincheira, among others.

Castro made his film debut in the drama Fuga in 2006 and received critical acclaim for his performance in Tony Manero in 2008.

In 2012, Castro decided to withdraw from the telenovelas with which he became popular and to which he had dedicated a large part of his life, the last being La Doña.

In 2014, Castro directed the famous play A Streetcar Named Desire by American playwright Tennessee Williams, starring Amparo Noguera, Marcelo Alonso, Luis Gnecco and Paloma Moreno.