Read previewNcuti Gatwa has had a busy year between starring in "Barbie" and taking on the lead role in "Doctor Who." But with success comes pressure, and the actor told Business Insider he has to "fight" to protect his physical and mental health as his star continues to rise. This story is available exclusively to Business Insider subscribers. Last winter, Gatwa took the reigns as the new lead of "Doctor Who," the longest-running sci-fi series of all time. Ncuti Gatwa plays the 15th Doctor on "Doctor Who."

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Persons: —, Who, David Harbour, Jonathan Bailey, Jenna Ortega, Gatwa, Eric Effiong, Ken, Ryan Gosling, Barbie, Ncuti Gatwa, David Copperfield, I've, he's, Kens, Gosling, Greta Gerwig, Greta, Margaret Organizations: Service, Netflix, Business, BBC