Ever eavesdropped on a conversation between two super-smart guys? Ensemble Theatre Cincinnati offers that opportunity with Freud’s Last Session. Set in 1939 on the eve of World War II, young theologian C. S. Lewis accepts an invitation to visit with esteemed psychoanalyst Dr. Sigmund Freud. Lewis is a devout Christian (he later authored The Chronicles of Narnia). Freud is an atheist, dying of cancer — and it’s just days before his suicide. Bruce Cromer plays Lewis; Barry Mulholland is Freud — both are top-notch performers. Director Michael Evan Haney says of Freud and Lewis, “two giants of the 20th century … with diametrically opposing ideas have a civil, respectful and loving argument.” The winner of several best-play awards in New York City, Freud’s Last Session has generated so much ticket demand that ETC extended its run for a second time through Feb. 16. $38-$42. Tuesday-Sunday. Ensemble Theatre, 1127 Vine St., Over-the-Rhine. 513-421-3555, ensemblecincinnati.org.