Watch Sadisflix. An access-all-areas look at the life of global megastar KSI as he goes through the most momentous year of his life. At the height of his fame, spurred on by a break-up, the multi-millionaire YouTuber, boxer and rapper starts to re-evaluate his priorities. How did JJ Olatunji, a nerdy kid from Watford become so successful and at what cost?