"Hello, I'm Johnny Cash." We welcome Boyd Holbrook – who portrays Johnny Cash in Bob Dylan biopic A Complete Unknown – to Popcorn Podcast. From writer and director James Mangold (Walk The Line), A Complete Unknown also stars Timothée Chalamet as Bob Dylan, Edward Norton as Pete Seeger, Monica Barbaro as Joan Baez and Elle Fanning as Sylvie Russo, and tells the electric true story behind the rise of one of the most iconic singer-songwriters in history, Bob Dylan. Within that story is the surprising relationship between Cash and Dylan. Holbrook shares the important aspect he brought to his performance as Cash and what he discovered about the troubled musician through letters Cash wrote to Dylan, as well as why Holbrook calls Chalamet a "trained killer”.

More Popcorn: Let us entertain you with our Better Man review

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• Visit popcornpodcast.com for movie reviews, celebrity interviews and giveaways.

• Popcorn Podcast interviews the biggest stars on YouTube: Popcorn Podcast.

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