“A Prophet” star Tahar Rahim looks unrecognizable as the serial killer Charles Sobhraj in the trailer for the upcoming thriller “The Serpent.” READ MORE: 65 Most Anticipated TV Shows & Mini-Series Of 2021 Based on the true story of Charles Sobhraj, the trailer for “The Serpent” teases the eight-part series about the notably dark story of Charles Sobhraj, who is believed to be responsible for the deaths of up to 20 young Western travelers between 1975 and 1976.