European philosophers: Friedrich Nietzsche, Martin Heidegger and Jean-Paul Sartre. The theme revolves heavily around the school of philosophical thought known as Existentialism, although the term had not been coined at the time of Nietzsche's writing and Heidegger declaimed the label. The documentary is named after the 1878 book written by Nietzsche, titled Human, All Too Human: A Book for Free Spirits.
| Actor | Role |
|---|---|
 Clive MerrisonReader | Reader |
 Haydn GwynneNarrator | Narrator |
| RRonald HaymanBiographer | Biographer |
 Will SelfAuthor | Author |
| RReg HollingdaleNietzsche's translator | Nietzsche's translator |
| MMartin PernetTheologian | Theologian |
| RRalf EichbergThe Nietzsche Association | The Nietzsche Association |
| AAndrea BollingerNietzsche archivist | Nietzsche archivist |
| KKeith Ansell-PearsonPhilosopher | Philosopher |