Watch The Secret Of Kells Full Movie Free Online As his medieval outpost faces a threat from advancing barbarian hordes, talented, young Brendan looks to finish illuminating an ancient book that could help keep his home safe. To do so, he will have to overcome his fears of an enchanted forest where mythical creatures are thought to hide. Brendan Gleeson ... Abbot Cellach (voice) Liam Hourican ... Brother Tang Leonardo (voice) Mick Lally ... Aidan (voice) Michael McGrath ... Adult Brendan (voice) Evan McGuire ... Brendan (voice) Christen Mooney ... Aisling (voice) Paul Tylack ... Brother Assoua (voice) Paul Young ...