Kobna Holdbrook-Smith brings a quiet intensity to his roles, making even brief appearances linger in the memory. In “Mary Poppins Returns,” he plays the kindhearted butler, reflecting a grounded presence amid the film’s whimsical chaos. The contrast between that performance and his role in “The Gorge,” where the stakes are higher and darker under director Scott Derrickson’s vision, showcases his ability to navigate very different worlds with equal conviction. Whether inhabiting period dramas or contemporary thrillers, Holdbrook-Smith has a knack for subtlety that avoids flashy gestures, instead drawing the audience in with nuanced expressions and timing. His work on stage, particularly in productions like “The Scottsboro Boys,” reveals a dedication to intense character work that translates seamlessly to screen. He may not be a household name yet, but his performances resonate because they feel lived-in, authentic, and never overshadow the narrative. For fans browsing through “Mary Poppins Returns” or the gripping moments from “The Gorge,” Holdbrook-Smith’s roles offer layers worth discovering beyond the surface.