Kathryn Hahn joins Apple TV+ exclusive 'The Shrink Next Door'

The limited Apple TV+ series is inspired by true events and details the "bizarre" relationship between psychiatrist Dr. Isaac Herschkopf, played by Rudd, and longtime patient Martin "Marty" Markowitz," played by Ferrell.

"The series explores how a seemingly normal doctor-patient dynamic morphs into an unprecedentedly exploitative relationship filled with manipulation, power grabs and dysfunction at its finest," Apple said in April.

Hahn ("WandaVision," "Mrs. Fletcher") is set to play Marty's younger sister, Phyllis, reports Deadline.

Michael Showalter ("The Big Sick," "The Lovebirds") will direct a script penned by Emmy-winning writer Georgia Pritchett ("Succession," "veep").

"The Shrink Next Door" is the second Wondery podcast to see adaptation for Apple TV+. Apple earlier this year inked a deal for the series "WeCrashed: The Rise and Fall of WeWork."

Last week, a report claimed Apple was in talks to buy Wondery, an independent podcast studio that boasts a number of hit shows like "Bunga Bunga" and "Dr. Death." The firm holds rights to a slate of content that can be remodeled for mainstream media platforms, more than a dozen of which have been optioned for TV shows.