Who voices this alien that Marge reveals to have had a one-night stand with and got impregnated with Maggie?
Treehouse of Horror IX "Treehouse of Horror IX" is the fourth episode in the tenth season of the American animated television series "The Simpsons". It first aired on the Fox network in the United States on October 25, 1998. This is the ninth "Treehouse of Horror" episode, and, like the other "Treehouse of Horror" episodes, contains three self-contained segments: In "Hell Toupée", Homer gets a hair transplant and is possessed by the spirit of an executed criminal; in "Terror of Tiny Toon", Bart and Lisa are trapped in a special, extremely violent episode of "The Itchy & Scratchy Show"; and in "Starship Poopers", Marge reveals that Maggie is the product of a one-night stand with the alien Kang.
List of The Simpsons guest stars In addition to the show's regular cast of voice actors, celebrity guest stars have been a staple of "The Simpsons", an American animated television sitcom created by Matt Groening for the Fox Broadcasting Company, since its first season. "The Simpsons" focuses on the eponymous family, which consists of Homer, Marge, Bart, Lisa and Maggie. The family was initially conceived by Groening for a series of animated shorts, which originally aired as a part of "The Tracey Ullman Show" between 1987 and 1989. The shorts were developed into a half-hour prime time series which began in December 1989. The series' 27th season began in September 2015 and episodes of "The Simpsons" have aired. A feature film adaptation of the series called "The Simpsons Movie", was released in 2007.