Television
Robles' first opportunity in television was offered in 1988 by Canal 10, a satellite station created by José María Calviño, before the birth of private networks and that broadcast from London. There she worked alongside Mon Santiso and Daniel Écija, among others.
In October 1989, she returned to Madrid and began to work as coordinator, scriptwriter, and presenter of TVE's regional magazine for Castilla–La Mancha, that was then broadcast from the center in Paseo de la Habana.
When the center moved to Toledo, Marta Robles decided to try her luck on Telemadrid, a newly created regional station, on which she presented the program El Ruedo. She later directed and presented Verano en La Complutense, and then the cultural magazine A todo Madrid. Finally she presented the weekend edition of Telenoticias with Rafa Luque. She remained with that station until 1991.
In 1992 she became an editor on Telecinco's news programs, where she would also present on some occasions.
In 1993, Jesús Hermida signed her to his new Antena 3 program Con Hermida y Cía. A year later, she was called on to present A toda página (1994–1997), which collected news of social interest and events.
In April 1996, she presented the historical memory program Qué memoria la mía, directed by José María Íñigo, which only remained on the air for two weeks.
From October 1996 to January 1997, she presented and co-hosted the 9:00 pm edition of the news program Antena 3 Noticias (1996), replacing Pedro Piqueras.
In 1998, still on Antena 3, she presented the investigative program Contraportada, and then the network's international news. A year later, she led the magazine El tiempo pasa, corazón.
In 2002 Robles presented the current events program Equipo de Investigación on Onda 6, and also contributed assiduously to TVE's Esta es mi historia.
In 2004 she returned to Telemadrid to present the magazine Gran Vía de Madrid (2004–2005) and then Madrid a la última (2005–2011), a show about fashion, trends, and current events, which she also created and directed. In 2012 she presented and directed the daily magazine Ahora, Marta, also on Telemadrid.
From 2014 to 2017, she worked on the TVE program Amigas y conocidas. Currently, she contributes to Espejo público on Antena 3, El cascabel on 13TV, and ¿Cómo lo ves? on TVE. In 2018, she covered the wedding of Prince Harry and Meghan Markle for DKiss.