In writer-director Mary Bronstein’s “If I Had Legs I’d Kick You,” out Oct. 10 from A24, Christian Slater is more heard than seen. His raspy voice — familiar from a host of memorable movies, from “Heathers” to “Blink Twice,” and a Golden Globe-winning role on “Mr. Robot” — is on the other end of the phone as Rose Byrne begins to depart from reality. Byrne plays a mother whose precarious housing situation and family health crisis push her to the edge; Slater is her husband, away on business and — upon his return — stunned to realize just how bad things have gotten.

Slater, who lives in New York, has lately had an increasingly busy and diverse career, including a run in an Off Broadway revival of Sam Shepard’s “Curse of the Starving Class” in the spring. He recently spoke to Variety on a w

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