What actors and actresses appeared in Symphorien - 1968?

You're likely referring to the 1968 French film "Symphonie pour un homme seul" (Symphony for a Man Alone), directed by Alain Resnais.

The main actors in this film are:

* Jean-Louis Trintignant as Paul

* Anouk Aimée as Marie

The supporting cast includes:

* Daniel Crohem as The Composer

* Catherine Jourdan as Catherine

* Florence Blot as Florence

* Jacques Monod as The Doctor

* Marcel Bozzuffi as The Man in the Cafe

This film is known for its experimental style, mixing live action with animation and exploring themes of memory, grief, and the nature of time.