The event aired as a special episode of WWE's weekly television series NXT, broadcast on the USA Network.

Mandy Rose defeated Raquel González to win the NXT Women's Championship, beginning her 413-day reign as champion, while the other members, Gigi Dolin and Jacy Jayne, won a Triple Threat Tag Team Scareway to Hell Ladder match to win the NXT Women's Tag Team Championship.

The event was scheduled to take place on October 26, 2021, at NXT's home base, the WWE Performance Center in Orlando, Florida.

Later on the same night, Tommaso Ciampa captured the vacant NXT Championship by defeating Pete Dunne, Knight and Von Wagner in a fatal four-way match.

[5] On the October 12 episode of NXT, after Indi Hartwell and Persia Pirotta's match, they staked their claims for the NXT Women's Tag Team Championship, after which, Io Shirai and Zoey Stark and Toxic Attraction (Gigi Dolin and Jacy Jayne) showed up and started brawling.

Later, William Regal decided that at Halloween Havoc, Shirai and Stark would defend their titles against Toxic Attraction and Hartwell and Pirotta in a Spin The Wheel, Make the Deal triple threat tag team match.

[6] On the October 19 episode of NXT, after Imperium's (Fabian Aichner and Marcel Barthel) tag team match, MSK (Wes Lee and Nash Carter) showed up and gave Imperium a tag team title shot at Halloween Havoc.

[7] The following week, a Spin the Wheel, Make the Deal match between González and Rose for the NXT Women's Championship was scheduled for Halloween Havoc.

[2] The television special began with Io Shirai and Zoey Stark defending the NXT Women's Tag Team Championship against Toxic Attraction (Gigi Dolin and Jacy Jayne) and Indi Hartwell and Persia Pirotta in a Triple Threat Tag Team Scareway to Hell Ladder match.

During the match, Pirotta tipped a ladder over, causing Stark to take out Dolin, Jayne, and Hartwell outside of the ring.

[8] Following this, Trick Williams and NXT North American Champion Carmelo Hayes pulled up to a haunted house, while Johnny Gargano and Dexter Lumis were in a security room.

[8] Next, Grayson Waller, dressed as a vampire, introduced the audience to Halloween Havoc, only to be interrupted by Joe Gacy, who came for his match against Malik Blade.

In the end, Harland appeared and grabbed Blade by the throat outside the ring, and back inside, Gacy performed a handspring clothesline to win the match.

[8] Following this, Carmelo Hayes and Trick Williams walked around the haunted house, where they punched a "monster" before being scared at creepy people.

Afterwards, Johnny Gargano and Dexter Lumis left the security room and put the NXT Zombie in charge.

Breakker then performed a standing Frankensteiner and attempted a Military Press Powerslam, but Ciampa countered into a DDT.

"[8] Matthew McFarlin of Slam Wrestling gave the event 3.5 out of 5 stars, saying: "Gimmicks and goofiness come with the terms of WWE Halloween specials, and it's always hit or miss.

The other members of Toxic Attraction, NXT Women's Tag Team Champions Gigi Dolin and Jacy Jayne, attacked Zoey Stark in the locker room.

[10] It was then reported that Stark suffered a legitimate torn ACL and meniscus during the attack, which she underwent successful surgery for.

[10] This led to a six-woman tag team match for the following week where Toxic Attraction defeated Shirai, Catanzaro, and Carter.

[13] The match was scheduled for NXT: New Year's Evil,[14] where Breakker defeated Ciampa to win the title for the first time.

[15] After losing the NXT Tag Team Championship to Imperium (Fabian Aichner and Marcel Barthel) at Halloween Havoc, MSK (Wes Lee and Nash Carter) spent the month of November going on a journey to find the legend of MSK called "The Shaman".

Riddle then appeared on the TitanTron and proposed a six-man tag team match between him and MSK against Imperium, which Walter accepted.

Io Shirai then grabbed a crutch from the injured Zoey Stark and attacked Kai and Toxic Attraction with it, sending them retreating.

[22] The following week, Kay Lee Ray was added to Shirai's team after causing Rose to lose to Jade in a non-title match.

[10] After what occurred in the haunted house at Halloween Havoc, Carmelo Hayes and Trick Williams took on Johnny Gargano and Dexter Lumis in a winning effort.