Viggo Mortensen is Sigmund Freud.

Michael Fassbender is Carl Jung.

Keira Knightley is Sabina Spielrein, Jung’s lover.

And this is the intense trailer for “A Dangerous Method,” the film about their relationship, from director David Cronenberg. This being a Cronenberg work and a movie about two influential psychoanalysts, rest assured that dark human impulses will be explored. “A Dangerous Method” is slated to premiere in September at the Venice Film Festival.