Fizzy Walnuts was a land squirrel, the Swedish cousin of some loser named Fuzzy Acorns, and legendary Blacker Belt Master in karate, who has so much skill that not even the great Dragon Warrior stands a chance of beating him (but then again, the Dragon Warrior has never been good at defeating things).
In sometime he and his deceased cousin "Fuzzy Acorn" are friendly and honestly masters of the karate, One day, Fizzy Walnuts was defeated by Fuzzy Acorns then everypeople includes Fuzzy Acorns and Sandy Cheeks tease him, Fizzy was shocked by the scene and his mind was corrupted and his body deformed.
After that, Fizzy Walnuts screams and kills, mutilates and scrunch Fuzzy Acorns, Sandy Cheeks and SpongeBob were traumatized by the scene, Fizzy escapes from the scene and starts to kill everybody in his road.
Later, Fizzy develops an intellect superior of all the scientifics in the world, becoming the morbid arcorn most intelligent in the universe and he are planning to use that skill to the evil.
He used to live high up in the mountains, occasionally coming out of his cave to fight Morton Koopa Jr., but after his rival Dark Tails moved the Weegee Troops underwater, Fizzy came down with him and joined the Skodwarde Squad to get closer to Dark Tails and finally finish him off. Legend has it that Fizzy is now teaching his Blacker Belt moves to a younger karate prodigy to continue Fizzy's legacy should he fail to kill Dark Tails before his time expires.
Fizzy is the first and only (so far) Skodwarde Squad member to not be a sea creature of any kind. He's also the only land squirrel living in Bikini Bottom who doesn't need an air helmet to live (he is so awesome, he just pulls the oxygen out of the water!). For some reason, though, Fizzy always has a pained expression on his face.
Fizzy has been proven to be completely defenseless against Tobuscus (Dark Tails' apprentice) because Tobuscus is so weird, Fizzy feels too uncomfortable to fight. He now spends most of his free time in his underwater cave watching creepy YouTube Poops in order to fix this weakness.
Fizzy returned joining the T.D Squad, now with new arms and new powers as well as a trained partner, Fizzy had the dream to destroy Tobuscus.
After hearing of the death of Pranktin, he made an autopsy to his body and founds a plan to resurrect Giygas, DEUUEAUGH Fish and Skodwarde. Fizzy took the souls of Giygas, Skodwarde, and DEUUEAUGH Fish and combined them with Pranktin's body with Colress's help. But Lord Tirek and Moar Krabs interferred with the resurrection, and the combined souls came out as a satanic monster known as Giywardeaugh (luckily this thing decided it owed its life to Fizzy for creating it), which may be the Skodwarde Squad's secret weapon to destroy the UMA once and for all, if it can beat DarkTeegee Norris...
After the failure and death of Giywardeaugh, he with Moar Krabs was rejected from The T.D Squad with other members by the new Leader of the T.D Squad, Mewtwo.
Now, Fizzy Walnuts and Moar Krabs are the only Skodwarde Squad members who are still alive, all of the others are dead. They later tried to commit suicide, but SpingeBill stopped them and said that he can make a new group of morbid and satanic monsters like the Skodwarde Squad and invited them to join, Fizzy Walnuts and Moar Krabs accepted SpingeBill's offer. The Masked One later told Spingebill that he made a mistake by inviting them to join.
Fizzy realized that he had lost everything all because that dreaded Dark Tails destroyed the Skodwarde Squad's last hope of survival. And then he crushed the Skodwarde Squad, along with all of Fizzy's dreams. Fizzy swore revenge on Dark Tails, and he forced Moar Krabs to help him. Fizzy decided to combine the two things he loved the most, martial arts and technology, and combine them to make a destructive war machine that not even Dark Tails could fend against, with Moar Krabs's help. This machine came in the form of a robotic martial artist named Dark Mercury. Fizzy built her to be incredibly strong and skilled in martial arts in order to fight Dark Tails, but he also included a secret that I.M. Meen claimed would "really make him cry!" Fizzy also made Dark Mercury extremely intelligent in terms of isolating opponents' weaknesses by adding DNA samples of many powerful beings, even including a sample of Dark Tails! Fizzy kept this project hidden from SpingeBill and the other members, but The Masked One found out. Three days after she was built, Fizzy sent Dark Mercury out to confront Dark Tails. The combined skill in martial arts and knowledge of DarkTeegee's strengths and weaknesses allowed Dark Mercury to win the battle by turning Dark Tails mortal with radioactive chocolate, and then beating the crap out of Dark Tails. Dark Mercury returned to Fizzy and brought Dark Tails's dead body back for proof of her victory. When the news reached SpingeBill, he realized that Fizzy was a truly valuable member for the Spinge Squad, and that now there was a chance to destroy the UMA and end the Weegee threat for good. While the Spinge Squad fed on Dark Tails's body for dinner, SpingeBill screamed at The Masked One for ever doubting Fizzy Walnuts. The Masked One said that just because they killed him, doesn't they beaten him. No one knew what he meant, same as usual.
At midnight Fizzy was along when an emotionless Dark Tails appeared out of nowhere. Fizzy stepped back thinking that it's impossible. Dark Tails then blankly said "You tried to kill me, but you failed. Now the tides had turned. I know we are on the same side, but I don't care." Dark Tails then took out a knife and decapitated Fizzy. Dark Tails then disappeared into the night.
Later his head was sent to the Death Squad, Tobuscus and Queen Chrysalis eat the head, Tubby thinks Dark Tails can be his friend yet.
Becoming a GodEdit
Both Moar Krabs and SpingeBill were disgusted by Dark Tails's deed, saying it was really nasty, even for someone as evil as Dark Tails who betrayed everybody. They wanted to resurrect Fizzy Walnuts, and they went to the place where Fizzy died, only to find that Fizzy had turned into a God. Fizzy told Moar Krabs and SpingeBill that as he was going into the light, the Great Mighty Poo stopped him. The Great Mighty Poo had told Fizzy that he had made a mistake to give Dark Tails that wish, that he only did it because he was grateful at the time because Dark Tails saved his life. But Dark Tails abused his power, and as it turned out, Dark Tails was a being of pure evil who was a traitor to everyone, even to his friends. The Great Mighty Poo said that Fizzy was a true hero because Fizzy stopped at nothing to do justice and establish world peace, and deemed Fizzy worthy of being a God. SpingeBill was touched by Fizzy's story and made Fizzy his second-in-command of the Spinge Squad.
Mewtwo them sent forces to capture and kill Dark Tails who made an agreement with Da-Da, Dark Tails will not kill Da-Da and work as Da-Da's assassin and Da-Da will let Dark Tails into the dream world. Dark Tails then entered the dream world, never to return. With that the Spinge Squad, the T.D Squad, and the Death Squad all declared him dead. Two months later they all entered peace and merged into one squad - the Mewtwo Squad.
Later, Fizzy Walnuts joins the group with Spingebill, Moar Krabs, Squidward Tentacles and Zalgo (the only survivors of the destruction of their squad). Now with his old partner Colress and a new partner Dr. Robotnik work together.
When the Mewtwo Squad discovered that Dark Tails had become a satanic demon who actually killed people in their dreams, Fizzy Walnuts provided Metwow with a Dream Machine that allowed people to enter Dream World. Mewtwo had most of the MS come with him, while Fizzy and a few others stayed behind. Fizzy had also saved most of the squad from being killed by Dark Tails's nightmares by waking them up.
- Fizzy hates M.Bison and I.M. Meen.
- Fizzy has an IQ superior to that of Dr. Robotnik's.
- Fizzy hates SpongeBob and Tobuscus
- He was responsible for the disease of Spengbab.
- He can give you nightmares if you look into his face for more than 2 minutes.
- The Skodwarde Squad
- Fighting Koopalings (especially Morton)
- Beating Dark Tails
- Being the proud wearer of a Blacker Belt
- The Krusty Krab
- Sandy Cheeks
- Being in harmony with the Universe
- Or better yet, being in control of it
- Great Mighty Poo
- Dark Tails
- Allies of Dark Tails
- T.D Squad
- Using an air helmet
- Unworthy students
- Being defeated in battle
- Frank Woods (Thinks he can do better than this morbid rat)
- Lex Luthor (Always telling him that he's WRONG!!)
- Pills (Doesn't need them)
- Ronnie McDoggle