“The Simpsons,” 7 p.m., Fox (new)
Trick or treat! It's time for that fall classic: the Treehouse of Horror. In one part, Bart is decapitated in a kite accident, and his head is placed on Lisa's body.
“Once Upon a Time,” 7 p.m., ABC (new)
Peter Pan gives Emma a map to Henry's location, but there's a catch, of course.
“The Amazing Race,” 7:30 p.m., CBS (new)
Teams take a strange salt bath while in Santiago, Chile.
“Family Guy,” 8 p.m., Fox (new)
Peter has a twin named Chip. The only problem is that he's growing out of Peter's neck.
“Boardwalk Empire,” 8 p.m., HBO (new)
Nucky (Steve Buscemi, above) is in Philadelphia to deal with the consequences of Willie's prank, while Eddie endures a detention by Agent Knox.
“Revenge,” 8 p.m. to 9:01 p.m., ABC (new)
Emily's next target is a former executive at Grayson Global who is now a clergyman.
“Low Winter Sun,” 8 p.m. to 10 p.m., AMC (new)
The first season of this police drama comes to a close with Frank struggling with his sanity, while the department catches a break in the McCann case.
“The Paradise: Part One,” 8 p.m. to 10 p.m., PBS (new)
An adaptation of Emile Zola's “Au Bonheur des Dames” begins with Denise moving from the country to a northern English city to work in a Victorian-era department store.
“Eastbound & Down,” 9 p.m., HBO (new)
Kenny considers a career move and tries to coax Stevie back onto team Powers.
“Masters of Sex,” 9 p.m., Showtime (new)
Masters blames Johnson when the hospital forces out the sexual response study.
“Witches of East End,” 9:01 p.m. to 10:03, Lifetime (new)
Two young women find out from their mother that they're actually powerful, immortal witches in this show's premiere.
“The Mentalist,” 9:30 p.m., CBS (new)
Jane stumbles onto a clue about Red John's methods.