Michael Fassbender plays Callum Lynch, a man who discovers his ancient Assassin lineage and his parallel ancestor, Aguilar de Nerha.
Marion Cotillard portrays Dr. Sophia Rikkin, a scientist working with Abstergo Industries who assists in uncovering Lynch's past.
Jeremy Irons takes on the role of Alan Rikkin, the head of Abstergo Industries and a key figure in Lynch's journey.
Brendan Gleeson plays Joseph Lynch, Callum Lynch's father, whose past influences the story.
Charlotte Rampling portrays Ellen Kaye, a high-ranking official at Abstergo Industries with a complex view on the Assassin's history.
Michael Kenneth Williams plays Moussa, a fellow Assassin who works with Lynch in the past.
Ariane Labed portrays Maria, a character connected to Aguilar de Nerha's story in the historical timeline.
James Sobol Kelly plays Father Raymond, a figure in Callum Lynch's past that plays a significant role in his upbringing.
Denis Ménochet takes on the role of Abstergo Güvenlik Müdürü, a security chief at Abstergo Industries.
Callum Turner plays Nathan, a character involved in the present-day storyline connected to Callum Lynch.
Khalid Abdalla portrays Sultan Muhammad XII, a historical figure in the story's exploration of the Assassin's legacy.
Essie Davis plays Mary Lynch, a connection to Callum Lynch's family and history.
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