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Maddie Ziegler and Bobby Moynihan (“Saturday Night Live”) have joined the cast of Colin Trevorrow’s drama “The Book of Henry,” his first feature since “Jurassic World.”

Focus Features is overseeing the production, which has started in New York, and holds worldwide rights, including for domestic release.

Previously announced cast include Naomi Watts, Jacob Tremblay (“Room”), Jaeden Lieberher, Dean Norris (“Breaking Bad”), Lee Pace and Sarah Silverman. Ziegler is known for appearing in “Dance Moms” and in Sia’s music videos “Chandelier” and “Elastic Heart.”

“The Book of Henry” stars Watts as a single mother raising two boys, one of whom is a genius. Treverrow is directing from a screenplay by Gregg Hurwitz, who adapted his novel of the same name.

The film is being produced by Sidney Kimmel Entertainment’s Sidney Kimmel and Carla Hacken, and by Double Nickel Entertainment’s Jenette Kahn and Adam Richman. Sue Baden-Powell and SKE’s John Penotti are executive producing.

Treverrow announced Ziegler’s casting on Twitter.