At Theater tonight is a TV show broadcasted from 25th August 1966 to 21st September 1985. The show is broadcast plays recorded in two or three days, during public performances at the Théâtre Marigny on the Champs-Élysées, or sometimes Edouard VII theater.

Convicted of murdering his wife, a crime of which he declares himself innocent, Jacques Mazur is serving a long sentence in a prison where his presence causes disruption.