1. Liz Lemon from 30 Rock as Harry Potter.
2. Anya from Buffy the Vampire Slayer as a bunny.
3. Phoebe from Friends as Supergirl.
4. Dennis from It's Always Sunny in Philadelphia as Luigi.
5. The cast from Happy Endings as The Jackson 5.
6. Dean Pelton from Community as the devil.
7. Mitch from Modern Family as Spider-Man.
8. Meredith from The Office as Black Widow from The Avengers.
9. Troy from Community as Ripley from Aliens.
10. Willow and Oz from Buffy the Vampire Slayer as Joan of Arc and God.
11. Leslie from Parks and Recreation as Rosie the Riveter.
12. Ross from Friends as Spudnik.
13. Dwight Shrute from The Office as the Queen of Blades.
14. Castle from Castle as Mal from Firefly (kinda).
15. Britta from Community as Michael Jackson.
16. Haley from Modern Family as Sexy Mother Teresa.
17. The Belcher kids from Bob's Burgers as a Mummy, Queen Latifah, and Edward Scissorhands.
18. Tracy Jordan from 30 Rock dressed in his Werewolf Bar Mitzvah costume.
19. Michael from The Office as Two-Headed Michael.
20. Alex from Happy Endings as Marilyn Monroe.
21. Tom from Parks and Recreation as T-Pain.
22. The cast from Suburgatory as the Scooby gang.
23. Liz Lemon from 30 Rock as Princess Leia.
24. Abed and Troy from Community as Calvin and Hobbes.
25. Darlene from Roseanne as Tippi Hedren from The Birds.
26. Jenna and Paul from 30 Rock as two black swans.
27. Sweet Dee from It's Always Sunny in Philadelphia as a sexy angel/bird.
28. Jim from The Office as Three-Hole-Punch Jim
29. The Simpson family from The Simpsons as nearly everything.
"Hello once again. As usual, I must warn you that this year's Halloween special is very, very scary, and those of you with young children may want to send them off to bed."