Dax Flame was only 15 when he became YouTube royalty - his channel was among the top 20 most subscribed in the early years of the site.
His success parachuted him into a Hollywood acting career. But 13 years later, his fortunes have changed - he's working as a waiter and trying to scrape together money just to get by.
We follow Dax as he tries to get back on track - and find out the answer to a mystery that has chased him around the internet for more than a decade. Are his videos "real" - or was he acting?
Video journalist: James Stewart
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<p>They have been blasted from car stereos on the streets of New York City, played by DJs at nightclubs across the US, dubbed into Chinese on TikTok and inspired merengue songs...