They Called Him Mostly Harmless (2024) is a Documentary, Crime, Mystery film that follows when an unidentified hiker is found deceased in the Florida wilderness, authorities release a sketch. Multiple hikers call in claiming to have met the man. There's only one problem – he never told them his name. It would take two years, thousands of devoted internet sleuths, and a miracle of science to identify him, and that's when the trouble really starts. Currently, you can watch They Called Him Mostly Harmless on HBO Max. Streaming availability may vary by country and platform over time. It has a user rating of 6.2 out of 10 from 30 votes. Fans of documentary movies may also want to explore similar titles below.