In episode three of THR’s special edition of 'Behind the Screen,' senior visual effects supervisor Joe Letteri, visual effects supervisor Richard Baneham, Wētā FX senior visual effects supervisor Eric Saindon and Wētā FX senior animation supervisor Daniel Barrett take listeners behind-the-scenes of how 'Avatar's' groundbreaking performance-capture technology achieves new depths of emotional resonance in 'Avatar: Fire and Ash.