Nickelodeon's Ultimate Halloween Haunted House is the name of two separate live half-hour television specials produced by Nickelodeon and starring actors from their live-action shows.
The first special aired on October 16, 2016 and featured actors from Henry Danger, Game Shakers, and The Legendary Dudas. It also featured special guest stars, Jojo Siwa and WWE wrestler Mike "The Miz" Mizain. The participants were split into three groups and had to each gather five keys from 5 different sets/rooms in the Haunted House. These sets/rooms included a haunted library, a cemetery and pumpkin patch, a giant room with a giant Jack-in-the-Box and clown, a mad scientist's lab, and finally, the attic where the groups had to unlock the door with their keys and try to get out before the zombie can get them. The event was hosted by Ricardo Rodriguez.
The second event aired on October 14, 2017 and featured actors from School of Rock, Henry Danger, The Thundermans, and Knight Squad. it also featured special guest star Jojo Siwa. As with last time, the participants had to be split into three groups and had to each gather five keys from 5 different rooms/sets in, this time, a haunted school. These rooms included home room, the nurse's office, the cafeteria, the art classroom, and finally, detention where the groups had to unlock the door with their keys and try to get out before the zombie students can get them. The event was hosted, this time, by Lizzy Greene from Nicky, Ricky, Dicky, and Dawn.