This is the second adaptation of John Gardner's "Grendel" novel, after Grendel Grendel Grendel (1981).
This is Robert D. Krzykowski first collaboration with Sam Elliott and Aidan Turner since L'uomo che uccise Hitler e poi il Bigfoot (2018).
This is the first movie Jeff Bridges, Sam Elliott, and T Bone Burnett have worked on since Il grande Lebowski (1998).
Thomasin McKenzie and Aidan Turner previously starred in Lo Hobbit - La battaglia delle cinque armate (2014) together.