Two actors from Unbreakable are returning for M. Night Shyamalan's upcoming sequel Glass. According to The Hollywood Reporter, Spencer Treat Clark will reprise his role as security guard David Dunn's (Bruce Willis) son Joseph. Meanwhile, Charlayne Woodard is coming back as Mr. Glass' (Samuel L. Jackson) mother. Spencer Treat Clark in Animal Kingdom.Glass will pick up right where Shyamalan's latest film, the James McAvoy-led thriller Split leaves off.