In 2018, Hilliard played Young Luke Crain in the
Netflix horror series
The Haunting of Hill House, created by
Mike Flanagan. His portrayal of the character earned him a Young Artist Award nomination for Best Performance in a Streaming Series or Film: Young Actor in 2019. The cast was nominated for an OFTA Television Award for Best Ensemble in a Motion Picture or Limited Series that same year. In 2021, Hilliard was part of the cast of the
Marvel Studios miniseries
WandaVision, set in the
Marvel Cinematic Universe and which aired on
Disney+. He played
Billy Maximoff, son of
Wanda Maximoff (
Elizabeth Olsen) and the
Vision (
Paul Bettany), and twin brother of
Tommy (
Jett Klyne). He later reprised the role in
Doctor Strange in the Multiverse of Madness, released in 2022. In 2021, Hilliard was part of the cast of
The Conjuring: The Devil Made Me Do It, the third installment in
The Conjuring franchise. He portrayed David Glatzel, a young boy who becomes the center of a supernatural investigation led by paranormal investigators
Ed and Lorraine Warren, played by
Patrick Wilson and
Vera Farmiga. == Filmography ==