The Grim Adventures of Billy and Mandy Wiki


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Alias Captain Spring Green, Sherlock Billy, William
Classification Human
Gender Male
Age 10
Residence Endsville
Relatives Gladys (mother)
Harold (father)
Sis (aunt)
Nergal (uncle)
Nergal Jr. (cousin)
Unnamed grandmother
Darold (paternal grandfather)
Jeff the Spider ("son") Del Uglio (supposed long lost twin brother)
Blandy (whom he wanted to be his future "spouse")
Pets Milkshakes
Mr. Snuggles
Affiliation Underfist
Occupation Student at Endsville Elementary School
King of Asgard
Real world information
Appears in Grim & Evil
The Grim Adventures of Billy & Mandy
Underfist: Halloween Bash
First appearance "Meet the Reaper"
Voice actor Richard Steven Horvitz
"Billy is an idiot, and will only understand the most extreme of punishments."
— Mandy

William "Billy" is the deuteragonist of the show. He is a dim-witted, happy-go-lucky boy living in Endsville. He is best friends with the Grim Reaper and Mandy, who treats him more like a servant than a friend, never being one to pass the opportunity to exploit the stupid. He was born with an extremely low IQ of -5, having been outperformed by a shovel and 2 candy bracelets on an IQ test. Good-natured and incredibly dopey, Billy's curiosity tends to get him into trouble he can't get out of by himself. Billy enjoys the company of Mandy and Grim and would do just about anything for them.


Billy and Mandy's first meeting

Billy and Mandy's first meeting.

Billy and Mandy met as babies when he came over to her house, repeatedly ringing her doorbell to annoy her enough to answer. When she did, the first thing she said to him was, "Are you some kinda idiot?". When he pointed out that she had no nose, he proceeded to shove an ice cream cone into her face, apparently creating a makeshift nose for her. Angered, Mandy punched Billy in the face, calling him a creep, and slammed the door in his face. Billy simply laughed and said, "She digs me". According to Harold, that day was the start of Billy and Mandy's friendship.[1]

Years later, while Billy and Mandy were celebrating the tenth birthday of his pet hamster, Mr. Snuggles, the Grim Reaper appeared to claim the old hamster's soul. However, Mandy refused to give the Reaper the hamster and offered to play a game for its soul instead. If the Reaper wins, he would get the hamster's soul. Grim, assured of his victory, sweetened the deal on their behalf by promising that if they win, he would be their best friend "forever and ever." Grim took Billy and Mandy to play, where they competed in Grim's favorite game—limbo. Mandy cheated, and Grim was doomed to be the "best friend" of the two kids for all eternity.[2]


Due to Billy's idiotic, foolish desires, which he orders Grim to bring about, he is often the cause of Grim and Mandy's mishaps. Billy, despite being a complete moron, sometimes has random bursts of cleverness and cunning, especially when he wishes to attain his said foolish desires. Although generally good-natured, he has occasional fits of stubbornness, violence, anger, and rage, which shows insanity that even Mandy seems to fear. While Billy is the most innocent character of the three, he ends up causing the most problems due to his irrational and often impulsive choice of actions, usually by deliberately doing what the others expressly told him not to do. Billy is terrified of clowns to the point of having recurring nightmares about them, although eventually, due to an encounter with his inner frat boy, his fear is transformed into a psychotic loathing and hatred for them, as shown in Attack of the Clowns. He is also scared of the mailman and spiders, which is quite unfortunate because he is Jeff's father (Billy hatched his egg), and Jeff is a huge spider.

Physical Appearance

Billy has an extremely large pink nose inherited from his father, Harold and orange-ginger hair from his mother, Gladys. He wears a white t-shirt with horizontal blue stripe, dark blue jeans and covers his ginger hair with a dark red hat. He also wears white and red sneakers.

He becomes a scientist for Underfist later on. By then, he starts wearing safety goggles, a white lab coat, purple gloves, and black boots.[3]

Relationships with other Characters

The Grim Reaper

After having lost a game of limbo to Billy and Mandy, Grim was forced to become the two's best friend forever. Billy is seemingly aware that Grim doesn't like him, most likely because he tells Billy that at every opportunity. However, he still treats Grim like a valuable and loyal good friend, even if he never listens to him. Nevertheless, Grim has shown that he slightly likes and cares for Billy, and would rather be with him than Mandy since she always orders him about and abuses him to her own selfish ends.


Despite being best friends, Mandy treats him more like a servant than a best friend, never being one to pass up an opportunity take advantage of his stupidity. Billy either seems to not notice this or enjoys it considering the only time he ever shouted at Mandy about her treatment of him was when she said, "Thank you". In some episodes, he has deep, friendly feelings for Mandy, often referring to her with terms of endearment like "baby", "babycakes" such as in Chicken Ball Z and in Keeper of the Reaper he tells her, "Goodbye, my dear, sweet Mandy,". He has also suggested wanting to marry her three times at minimum, once in The Really Odd Couple while she and her family stayed at his house, he suggested doing many things with her, including getting married. He also shows great enthusiasm in taking Mandy as his wife when the judge in Keeper of the Reaper mistakes their trial for a wedding. In Spidermandy, he proposes to Mandy, but only because he wants Jeff the Spider out of his life. Billy may have more-than-friendly feelings for Mandy, though he fails to realize so in his own stupidity. Billy has protected Mandy from getting her brain taken in Little Rock of Horrors. He once responded to her insult by saying "I love you" as well as kissing her numerous times by licking her face and once legitimately kissing her out of gratitude, causing her to pass out in disgust. Mandy has also shown signs of deep care for Billy, whether their feelings towards each other be platonic or not, Grim still teases them about it every now and then.


Billy gets along with Irwin more than anyone else. The two boys’ both have much in common, they both enjoy activities which are normally nerdy. But they are also extremely different; although Irwin has his moments of stupidity, he is also very smart and is considered a 'math nerd', 'socially inept', and 'the computer illiterate' according to Mindy.


Jeff believes that Billy is his father, which is not the best thing to be since Billy has arachnophobia. Billy found Jeff's egg in Grim's trunk and since Jeff saw Billy first when he hatched from his egg, he imprinted on Billy as his parent. Since then Jeff has done everything possible to win his "dad"'s love. However, no matter how good a arachnid Jeff is, one who anyone else would be proud to call "son", spider or no spider, all Billy can see is a disgusting monster, which he beats at every possible opportunity.

Fusion Fall

In FusionFall, During the war, Billy adopted a Fusion Spawn named Runty, which later turns out to be his imaginary friend. Most of Billy's missions are rather pointless, but sometimes lead to more important tasks: Once Billy had the player retrieve Irwin's stuff, so that he may "watch it". Other times he had the player collect food and cage lining for Runty, in doing so revealing Fusion Mandy's lair in the Sand Castle.In his own self interest, Billy sent the player out to remove the Re:Fuse posters found in Habitat Homes after being paid 20 bucks to do so by the leader of the Beautification Organization, Fusion Father. Little did he know that in doing so, he caused the local Fusion monsters to return to their normal destructive selves. Due to his fear of clowns and nightmares he'd been having, Billy has the hero go south to City Point, in order to defeat the Destroyusalls . He then has you collect their noses, but Billy thinks the noses are scary, so the hero gives the noses to Bloo. Billy also tricked the player and stole his/her power of destiny, which allowed him/her to activate totems, just because he thought it was cool. Soon following Billy's attempt was Hex, who was unaware that Billy already stole the player's power. However, Mandy gives the player the Pillow of Common Sense, a strange pillow that actually took back the player's ability from Billy by smacking him with it and Mandy returns the player's powers to him/her (saying that she COULD have kept the powers herself but decided she already had common sense). In the last attack on a Fusion Control Center, Demongo planned to have Eduardo join the hero to provide an assault of Imaginary Energy. Billy showed up instead, thinking that the Control Center was the site of a party. He later showed up in Fusion Kevin's base under the same premise. This time however, he was able to make himself useful by overloading a force field made from imaginary energy stolen from Foster's Home, allowing the player to defeat Fusion Kevin which proves Billy is not that dumb.


Billy's Damomdy
The image gallery for Billy may be viewed here.


Billy FusionFall

Billy in FusionFall

  • Billy is one of the many characters in FusionFall.
  • He also has questionable schizophrenia, indicated in Bearded Billy when he overhears his father in the bathroom and tells his mother, "the bathroom is talking to me again," and asks her for his "vitamins".
  • In The Crawling Niceness, it is revealed that he is afraid of spiders and also Jeff the Spider.
  • Billy may have been responsible for Irwin's crush on Mandy; in the episode "Get Out of My Head!", he flirts with Irwin while in Mandy's mind, causing Irwin's emotional state to switch from frightened of Mandy to smitten by the remarks that Billy (in Mandy's mind) makes. This could be why Irwin has a crush on Mandy, as it had not been established until then.
  • Maxatomar Ben 10

    Maxatomar from Ben 10

    An alien in the Ben 10 series is based on Billy. The alien is orange, scaly and bloated with a large orange and pink nose, pointed ears and bad teeth. It is voiced by Richard Steven Horvitz and wears a blue and white striped shirt, and a red hat. It's species is named the Maxatomar (named after Maxwell Atoms).
  • His scientist uniform in Underfist: Halloween Bash is an allusion to Dexter from the TV series, Dexter's Laboratory.
  • In Attack of the Clowns, It is revealed that he is afraid of clowns.
  • Billy's intelligence can also affect reality (similar to Mandy's smile) in Billy Gets an "A".
  • Billy's nose is removable, on one occasion even growing back after coming off.
  • Also similar to Mandy, who is mistaken for a boy on more than one occasion, Billy has been mistaken for a little girl.
  • It was confirmed in The Nerve that Billy had a brain but as little as an ant.
  • In Billy and Mandy's Big Boogey Adventure, it is revealed that he had three fears, spiders, clowns and the mailman. He also has a fear of the Spider-Clown Mailman.



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