World Health Organization. 2005. pp. Highlander (1986), Braveheart (1995), Trainspotting (1996), Troy (2004), The Chronicles of Narnia: The Lion, the Witch and the Wardrobe (2005), Ben-Hur (2016), and Wonder Woman (2017). On television, he appeared as Father Kellan Ashby on the 3rd period of Sons of Anarchy (2010), Jeor Mormont on HBO's Game of Thrones (2011-2013), Farder Coram in the BBC series His Dark Materials (2019), and Luka Gocharov on the 3rd period of Amazon Prime's Jack Ryan (2022). Cosmo appeared as a contestant on the nineteenth series of Celebrity Big Brother in 2017, finishing in fourth place. He appeared in Troy with long term Game of Thrones forged associates Sean Bean and Julian Glover. He appeared as Lieutenant-Colonel Philip Drysdale in the seventh collection of Soldier Soldier. The sequence began filming on November 20, 2020, in Los Angeles. He was included in the filming of the thriller Breakdown in which he appeared together with Craig Fairbrass, Bruce Payne, Emmett Scanlan, Olivia Grant and Tamer Hassan. He also appeared in UFO as SHADO operative Lieutenant Anderson, in Take the High Road as Alex Geddes from 1982 until eventually 1983 and in 1984 played Jock McLeish in the Minder episode Senior Citizen Caine.