Question: what language are they speaking on alpha?
Answer: The film's main cast includes Kodi Smit-McPhee as Keda, the Palaeolithic teen protagonist, and his father Tau, played by Game of Thrones actor Jóhannes Haukur Jóhannesson. Jóhannesson can speak four languages, including Icelandic, Faroese and Danish, besides English.