Aidan Gillen (Little Finger, GoT/Janson, The Maze Runner)
Thomas Brodie Sangster (The Maze Runner)
Kaya Scodelario (Maze Runner, Pirates of the Caribbean 5)
KJ Apa (Riverdale)
Joseph Morgan (The Vampire Diaries/The Originals)
Candice Accola (The Vampire Diaries/The Originals)
Dylan O'Brien (Teen Wolf)
Any of the LOTR/The Hobbit cast, in any capacity.
Steven Yeun (The Walking Dead) to return