In 2002, he decided to pursue a career in acting, although he had no previous experience and within days he became a member of the Screen Actors Guild.

Desmond Gumbs, the director of Straight Out (2003), (his first film) took a great risk on Muñoz's raw talent and cast him in a major plot-driver role.

He has been in television and editorial commercials including Bank of America, Nissan Altima and Infinity Insurance.

He then tried to pursue an acting career in the Hispanic-Latin market and he was soon given a feature role in the Telemundo production, El Rostro de Analía as a hitman for Gabriel Porras as Ricky Montana.

In June 2010, Antonio is worked in Petén with Dr Richard D. Hansen, providing all the logistic and helicopters for the exploration of El Mirador, the largest Mayan ruins.