Sergio Ciscar

 is a character in the Spanish crime drama limited series Muted. He is portrayed by Arón Piper.

Biography
Sergio is the son of Blanca Polo, a psychiatrist. He is very intelligent with an IQ of 154. As soon as his mother realised Sergio's talent, she focused on his education, but something went wrong almost immediately. Sergio alternated academic success with a progressive emotional detachment from his family.

On March 23, 2016, Sergio Ciscar murdered his parents by pushing them off the balcony of their apartment. He was sent to prison.

While in prison, his fan Marta Ortega sent him letters and met him more than once. They had a private visit 6 months before Sergio's release.

After 6 years in prison, on April 16, 2022, Sergio was released 9 months early for good behaviour, as he worked on a greenhouse while in prison. He returned to his parents' apartment, which he inherited, despite murdering them.

After his release from prison, Sergio was secretly monitored by a team of psychiatrists, led by Ana Dussuel, who want to determine his threat to society. They watched him from hidden cameras in his apartment and public CCTV. They also followed him. They monitored him daily and did behaviour analyses.

Sergio has selective mutism. He is religious and Natanael, an evangelical priest, is one of the few people he speaks to.

Marta and Sergio develop feelings for each other, but she finds it challenging due to Sergio's selective mutism. Marta and Sergio's relationship causes complications as Eneko is deeply in love with Marta and believes Sergio is dangerous.

Throughout Muted
After Sergio's release from prison, Marta meets up with him. She hands him a handwritten note with Noa's phone number. Sergio and Noa lost contact after the murders.

Appearances

 * Muted

Trivia

 * Sergio has an IQ of 154.