Suggestions by @civairot

Sharman Macdonald

as Mary Keay in The Magnus Archives

Nicholas Hope

as Trevor Herbert (The Hunt) in The Magnus Archives

Tobin Bell

as Simon Fairchild (The Vast) in The Magnus Archives

Lisa Bonet

as Linette Montauk (The Dark) in The Magnus Archives

Rooney Mara

as Agnes Montague (The Desolation - older) in The Magnus Archives

Lily Collins

as Agnes Montague (The Desolation) (younger) in The Magnus Archives

Bethan Walker

as Gertrude Robinson (younger) in The Magnus Archives

Dafne Keen

as Jane Prentiss (The Corruption) in The Magnus Archives

Emma Thompson

as Gertrude Robinson (present) in The Magnus Archives

Ella Purnell

as Sarah Baldwin (The Stranger) in The Magnus Archives

Helena Bonham Carter

as Nikola Orsinov in The Magnus Archives

JuJu Chan

as Jude Perry (The Desolation) in The Magnus Archives

Delroy Lindo

as Adelard Dekker in The Magnus Archives

Robbie Magasiva

as Mikaele Salesa in The Magnus Archives

Elya Baskin

as Gregor Orsinov in The Magnus Archives

David Suchet

as Jonah Magnus in The Magnus Archives

Frank Bourke

as John Amherst (The Corruption) in The Magnus Archives

Ruta Gedmintas

as Alice "Daisy" Tonner in The Magnus Archives

Cillian Murphy

as Peter Lukas in The Magnus Archives

Zendaya

as Julia Montauk (The Hunt) in The Magnus Archives