Mad Dr. Hibbert's Manor

 is a limited-time premium building that was released on October 24, 2021, as part of Act 3 of the Treehouse of Horror XXXII Event. Upon completion, Panther Marge is unlocked.

Regular
Comic Book Ram Marge Panther Marge
 * Wax Horns - 60m
 * Relax and Enjoy the Animal Lifestyle - 4h
 * Go See How the Mad Half Lives - 5h
 * Rub Lotion on Walrus Homer - 4h
 * Lounge Languidly in the Sun - 12h

Quest Based
Carl Comic Book Guy Comic Book Ram Lenny Mad Dr. Hibbert Panther Marge Character Groups
 * Fight With Lenny About Animal Dogma - 4h
 * Explain Entire Radioactive Man Continuity - 4h
 * Stop a Schism - 4h
 * Fight With Carl About Animal Dogma - 4h
 * Scheme - 8h
 * Put Oil on Walrus Homer's Belly - 4h

Springfielders
 * Learn About Satyrism - 8h
 * Try to Grasp Satyrism - 3h

Event's Quest Based
Dr. Hibbert Homer Mad Dr. Hibbert Marge Panther Marge
 * Train Hybrids for Combat - 4h
 * Encourage Walrus Homer - 4h
 * Train Hybrids for Combat - 4h
 * Grumble at Panther Marge - 4h
 * Flirt With Homer - 4h

Limited Time
Bart Grampa Grampasaurus Homer Lisa Mecha-Chalmers Mr. Burns Panther Marge Professor Frink Skinner Smithers
 * Donate DNA - 4h
 * Donate DNA - 4h
 * Extract DNA - 4h
 * Donate DNA - 4h
 * Donate DNA - 4h
 * Extract DNA - 4h
 * Donate DNA - 4h
 * Extract DNA - 4h
 * Donate DNA - 4h
 * Donate DNA - 4h
 * Donate DNA - 4h

Trivia

 * Only one can be obtained.
 * It can be placed on grass, pavement, dirt, krustyland road, boardwalk, pier, edge of boardwalk, or edge of pier.