Drew Adkins has replaced Dallas Jokic as Arthur , Jake Beale has replaced Robert Naylor as D.W. , Siam Yu has replaced Lyle O'Donohoe as Brain , Jacob Ewaniuk has replaced Dakota Goyo as Timmy .
Robyn Thaler has replaced Alexina Cowan as Catherine .
Drew Adkins has replaced Dallas Jokic as Arthur , Jake Beale has replaced Robert Naylor as D.W. , Siam Yu has replaced Lyle O'Donohoe as Brain , Jacob Ewaniuk has replaced Dakota Goyo as Timmy , and Robyn Thaler has replaced Alexina Cowan as Catherine .