New to this outing are Donnie Yen, Bill Skarsgård, Hiroyuki Sanada, Rina Sawayama, Shamier Anderson, Clancy Brown and Scott Adkins.

Source: https://www.latimes.com/entertainment-arts/movies/story/2023-03-13/john-wick-4-sxsw-keanu-reeves-donnie-yen

The main villain of the movie is the barbarian Kurgan, played by Clancy Brown in the original.

Source: https://screenrant.com/highlander-reboot-remake-news-cast-story-everything-we-know/

The trailer features the Harbinger (Clancy Brown) declaring that failure to meet for the duel on time will be punished via execution.

Source: https://www.slashfilm.com/1181346/in-john-wick-4-bill-skarsgards-marquis-will-wield-the-most-evil-weapon-of-all-bureaucracy/

They join stars Jaz Sinclair, Lizze Broadway, Chance Perdomo, Maddie Phillips, Asa Germann, Patrick Schwarzenegger, and Clancy Brown.

Source: https://www.cbr.com/gen-v-image-soldier-boy-jensen-ackles/