Sonic: Night of the Werehog is a 3D animated dialogue-less short by Sega based on Sonic Unleashed, in which Sonic and Chip enter a classic haunted house that is haunted by 3 ghosts; 2 trying to win the affection of one ghost girl through photographing Sonic and Chip's scared reactions. However, the ghosts didn't expect the brave Sonic to be a werehog. In Japan, the short is subtitled Sonic & Chip: House of Horror (ソニック＆チップ 恐怖の館 Sonikku to Chippu Kyōfu no Kan?).
The short opens with two boys entering a haunted house while a rain storm comes down outside. As they explore the house, they are unknowingly watched by two Ghost Photographers, a tall slim one wearing a bandanna and a short fat one wearing a bow tie, and they take their photos the moment they scare them. Once they take their photos, they return to a female Ghost with long purple hair and present her their photos. In her room are various pictures of frightened people that the Ghost Photographers have taken photo of (marked each specifically with their special marks of a bandana and bow tie). Ultimately, the Girl Ghost chooses the Bandana Ghost's picture and kisses him. Just as the Bow Tie Ghost feels defeated, another knock comes at the door and he grins.
This time, Sonic and Chip enter the house together with Chip frightened by the surroundings while Sonic is interested in some things. The Bow Tie Ghost scares Chip when he passes by a mirror with a freaky reflection of himself and when he shows his taken photo, the Girl Ghost kisses him twice, seemingly taken a liking to Chip. Soon enough, the Ghost Photographers pop up everywhere Sonic and Chip go, scaring Chip and then getting his photos (one moment included Sonic teasingly scaring Chip, causing him to faint). The pile of pictures of a frightened Chip grows and grows with each scare. The Girl Ghost was affected while looking at Chip's various photos until she was dismayed upon finding three of their taken photos showing Sonic, enraged they took photos of a fearless Sonic (three pictures show him holding a book, yawning and making a face at the camera).
Annoyed by Sonic, the two Ghost photographer come after Sonic and Chip in knight armor. As Chip cowers in fear, Sonic starts shuddering and collapses to his hands and knees. The full moon is revealed behind the clouds in an open window and Sonic undergoes his transformation into the Werehog. Once Sonic transforms, he scares both Ghosts into fleeing the scene leaving Sonic and Chip confused and look at each other. But when they return to the Girl Ghost, she was laughing uncontrollably because their cameras took their own scared faces by accident. The picture of Sonic making a funny face drops to the floor when the Girl Ghost bangs her fists on the table with laughter. Upon seeing the photos of Sonic and themselves and hearing the Girl Ghost's laughter, both Ghosts become humiliated, embarressed and above all, angry. Their pride now hurt, both Ghosts decide to team up and form a green glowing Minotaur-like Ghost to attack Sonic called "Baker".
While Sonic uses his Werehog powers, Baker gains the upper hand since it becomes invisible and unable to be struck by the Werehog's stretching punches. But as they fight, Chip discovers that Sonic can see Baker by taking its photo. But even with the camera at his disposal, Sonic is unable to fight since he needs time for the photos to develop (three he has taken have Baker making the same poses as when they took his photos).
Ultimately, the Werehog is tackled into a wall after losing his temper and attacking wildly. As Sonic lays unconscious on the ground, Baker proceeds to take his photo. But this is the two Ghosts being greedy again, as they separate back to their previous forms with their bodies connected by Baker's legs when fighting over the camera. As they fought over the camera and who take the photo, Sonic reawakens and attacks them by knocking them down and swinging them around by their legs before sending them flying out of the roof with a powerful punch. Since the camera went off just before Sonic sends the final blow, the Girl Ghost found the taken photo is of Sonic as the Werehog.
After seeing Sonic's werehog form, she falls in love with the Werehog and sees Chip as her way of getting closer. When day comes the following morning, Sonic exits the mansion as the Werehog followed a Chip-impersonating Girl Ghost (the Girl Ghost's heart mark can be seen on his face). She offers Sonic for a photo with her and he agrees, while the real Chip is tied up in a chair in the mansion with the Bow Tie and Bandana Ghosts watching the Girl Ghost interacts with Sonic. When the photo was taken and developed, the Girl Ghost is shown in her Ghost Form. After the credits roll, Sonic and the Girl Ghost depart together as the other Ghosts watch them and sadly sigh as Chip struggles to escape from them.Sonic Night of the Werehog(11:21)
- Kid 1
- Kid 2
- Sonic the Hedgehog/Sonic the Werehog
- Chip/Light Gaia
- Bandana Ghost
- Bow Tie Ghost
- Girl Ghost
- In Sonic Unleashed the two ghost photographers have also appeared in Spagonia and Adabat on the missions "Tower Terror" and "Fright Fight".
- In Sonic Unleashed the ghost's cameras can also be seen in the scene were Sonic and Chip visit Eggmanland and Chip tries to take a picture.
- During the premiere, Comcast cable systems showed Night of the Werehog in its Video On Demand Service.
- One picture taken by the Bandana ghost shows a kid laughing.
- When Sonic and Chip are walking down a hallway, there is a portrait of the Bandana ghost on the left wall.
- During the fight scene between the powerful ghost and Sonic the Werehog in the tall room, a Sega Dreamcast can be spotted three times.
- Sega's Joypolis theme park has showings of Night of the Werehog in 3D.
- The short has only 5 short lines of dialogue. They are when Sonic says "Whoa" when entering the house, "Oops" when he scares Chip, causing him to faint, when Chip says "Aha" after figuring out a way to see the powerful ghost, a "Hey" when Chip throws Sonic the Werehog the camera, and Yay when Sonic and Chip celebrate.
- On the female ghost's mural there's a poster of the 1941 movie, The Wolf Man. On the poster, the Wolf Man looked much like Sonic's Werehog form except that the werewolf's claws were black and he didn't have Sonic's quills. Also on the mural (if one looks carefully) is a poster of the 1932 movie, The Mummy.
- On the board where the pictures of scared children are posted, underneath there is a decorative plate with the ghost girl on it, but it appears that the picture is from when the ghost girl was still alive. She also has a white cat next to her.
- During the beginning of the fight scene, there are three pictures on the wall over the fireplace that seem to feature the Bandana ghost, the female ghost and the bow tie ghost as humans.
- The two ghosts who Sonic fights bear a close resemblance to the ghosts in Casper, but with fangs.
- There was going to be a scene that would feature Sonic and Chip playing a Dreamcast.
- There was a deleted scene where Knuckles the Echidna walks up to Sonic the Werehog.
- What was assumed was an error, Sonic obtains the flashlight after he walks through the room with the mirror and tables to scare Chip. He must have picked up the flashlight the two boys at the beginning probably dropped.
- Sonic mocks the two ghosts when they first take pictures of him in his hedgehog form. Later when the two ghosts combine they pose mockily the same way Sonic did to tick him off during their fight.
- To tell the difference between which ghost took what picture, there's a bow tie or a bandana on the bottom of each photo taken.
- When Sonic leaves the mansion, the sun is up and he's still a werehog. However, after a few seconds he turns back into a hedgehog anyway.
- In the short film, Sonic remains as his normal self through the night, until the full moon is shown. But in the game, Sonic transforms by the sunset and becomes the Werehog regardless on whether or not there is a full moon. Although this could have been done as a nod to the werewolf myths due to the Girl Ghost liking Werewolves.
- Executive Producer: Okitane Usui, Hisao Oguchi, Kouchi Fukazawa, Hideki Okamura
- Producer: Takeshi Itou
- Director: Takashi Nakashima
- Production Manager: Kei Miyamoto
- Supervisor: Shinji Aramaki
- Line Producer: Masahito Imamura
- Art Director: Shinji Usui
- Character Supervisor: Jun Masuda
- Line Supervisor: Takuya Hada
- Supervising Animator: Jiro Yamagishi
- Director of R&D: Jun Saito
- Supervising Technical Director: Masayuki Tanaka, Kengo Takeguchi
- Japanese Character Voices: Jun'ichi Kanemaru, Tomokazu Seki, Ryoko Shiraishi, Momoko Ishikawa
- English Character Voices: Jason Griffith, Tony Salerno, Kevin Glenz, Ryan Drees
- Music: Tetsuya Takahashi
- Sound Design/Mixing Engineer: Kouji Kasamatsu
- Character Design: Illustraors Unit Gutihiru
- Sculptor (Moquette): Masanori Yoshida
- Editor: Ryuji Miyajima
- Pre-Production: Tomokazu Takahashi, Minoru Kusakabe, Naozumi Yamaguchi
- Art: Hiroaki Ueno, Hiroyuki Kinoshita
- Modeling: Kenichi Nishida, Toshiya Umeda, Satoshi Kounosu, Takayuki Hayama, Emiri Minagawa
- Sets: You Amano, Yoshihiro Hanado, Kazushige Hayakawa, Yutaka Yamaki, Hidwyuki Higashi
- Sufacing: Takahiro Arakawa, Hideaki Makinouchi, Satoshi Takahashi
- Rigging: Kiminori Kuano, Kenou Hakamaya, Tatsuya Akagi, Ayako Sakurai, Tomohiro Hanawa, Yoko Ukai, Kengou Nukizono
- Animation: Yusuke Sakai, Tsuyoshi Tanaka, Takaaki Kise, Tatsunori Tomiyama, Yoshimasa Kimura, Tomokazu Sakamoto, Hideyuki Kinoshito
- Effects: Shuntaro Furukawa, Wataru Kitamura, Daisuke Satoyoshi
- Lighting: Satoshi Tomatsu, Tsubasa Nakai, Hirokazu Ayukawa, Tomoya Kowase
- Software Development: Seymour Wakisaka, Mio Tagiri, Tomoaki Sato, Gaetan Guidet, Yoko Sano, Tatsuya "Cap" Syuzui, Tomoya Matsumura, Takamasa Matsunari, Moes Marcelo Morales, Shoumo Hosaka, Yusuke Ishikawa
- System Adminatraion: Yuji Umeki, Toru Iwata, Yusuke Yanagisawa, Yukari Imai, Tsuyoshi Ando
- Project Assistant & Director Assistant: Tomohiro Mitsui, Ayano Fukuda, Naomi Tsujishito, Rumi Osagawa, Noriaki Hashimoto, Miho Ogawa
- Voice Recording Director: Eriko Kimura
- Voice Recording Producer: Takuya Ohno
- Recording Studio: Sega Dgital Studio
- Special Thanks: Akinori Nishiyama, Yoshihisa Hashimoto, Sachiko Kawamura, Tadashi Takezaki, Toyokazu Hattori, Akira Aoyama, Atom Kobayashi, Mana Nakano, Kousei Kimoto, Shin Kageyama (I'm Enterprise), Akiko Nakahata (A&K Corp. Ltd.)
- Created By: Sonic Team's CG Movie Team
- Presented By: Sega
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