Mid-flight, a young man calmly announces he is Casper the friendly ghost and throws the plane's keys out the window. This episode explores Daniel Johnston, the outsider musician whose childlike art ran parallel to a lifelong battle with bipolar disorder.

We trace his lo-fi cassette recordings on a cheap boombox, his hand-to-hand distribution at an Austin McDonald's, and how a Kurt Cobain t-shirt sparked a major-label bidding war for an artist who was, at the time, inside a psychiatric hospital.

• How a $59 mono boombox birthed his intimate lo-fi sound
• Handing out unique, re-performed tapes to customers
• Why he rejected an Elektra deal over a fear of Metallica
• The community fight to save his Jeremiah the Innocent mural
• His final tour backed by artists he had influenced