Master Billy Quizboy
The Venture Bros. character
Heroic Billy Quizboy.png
Master Billy Quizboy
First appearance

The Terrible Secret of Turtle Bay
Last appearance

The Forecast Manufacturer
Voiced by

Doc Hammer
Real Name

Billy Whalen
Aliases Master Billy Quizboy
Dr. Whalen
Dr. Phil Donahue
Blue Leader
Hobbit Oppenheimer
Gender Male
Occupation Neuro-geneticist
Family Rose Whalen (Mother)

Self-proclaimed "boy genius"
Bionic arm
Speech impediment

Conjectural Technologies
The Order of the Triad

Student of Prof. Hamilton G. Fantomas
The Revenge Society (forced member)

Augustus St. Cloud (Archenemy)
Henchman Zero (Deceased)

Master Billy Quizboy (real name: William Whalen) is a supporting character appearing on the Adult Swim show The Venture Bros. He is a friend and ally of Dr. Venture and Team Venture as well as business partner and close friend of Pete White. He is voiced by Doc Hammer.

Character history

Prior Life

Billy was born Hydrocephallic, which he says is caused by spinal fluid that he absorbed into his head while in his mother's womb. He was born with a high intelligence, but still had a hard time with certain things. He was a big fan of Rusty Venture to a point where he thought of him as his hero. When he hit his teenage years, he began the game show circuit and worked with game show host Pete White who helped him win most of the contests until they were caught. Pete suggested that they go see his friend Rusty for jobs. Originally Billy was excited to meet his hero.

The two set out to see Rusty, but were soon disappointed after Rusty had turned them away. The two would eventually enter the underground game show circuit for money. Billy soon after called it quits after he lost his left eye and left hand in a dog fight that White thought was a game show. Billy was captured by Hunter Gathers and Brock Samson, who gave him a new bionic hand and eye, but for the price of spying on a possible member of The Guild of Calamitous Intent by the name of Professor Fantomas. He spied on Fantomas until he believed that it was a misunderstanding and rebelled against Hunter and Brock.

After rebelling against Brock and Hunter, he ran to Fantomas' lab, where Fantomas was waiting for him to help him with his experiment to fix his tiny limbs. During the experiment Fantomas revealed to a shocked Billy that he was part of the Guild. Fantomas' machine started to malfunction, and Billy revealed his ineptitude and his cheating to a shocked Fantomas. The machine created a portal that sucked Fantomas and Billy's left bionic eye into it. Billy was taken to the OSI headquarters, where his memory of the incident was wiped away. The memory-erased Billy was brought to Pete White in a duffel bag in the desert where White had set up a trailer marking the spot he last saw Billy before they parted ways. They appear to reside in that trailer, next to The Venture Compound, making it their home for many years.

Billy took to wearing an eyepatch to replace his missing eye. He was inspired to become a scientist and child prodigy by his future friend Dr. Venture during his time as Rusty of the original Team Venture. Despite learning his Hero was in fact a burnt-out failure of a scientist, Billy continued to hold Rusty in high reverence. Despite his lack of training or schooling, Billy became a highly skilled physician.

Later Life

Billy first appeared in The Terrible Secret of Turtle Bay, where he mocked Dr. Venture for his Ooo-Ray but did not do much else — his appearance here was even more abbreviated than it usually is. He then appeared as an invitee to Prof. Impossibles government think-tank in the episode Ice Station – Impossible!, awed at the fact that Impossible invited him. He helped Dr. Venture, Sally Impossible, and White develop an antidote for the Goliath serum that Hank had consumed (although Prof. Impossible later claimed the serum was never tested on a human, it was supposed to be used on a "dog or something"). He also featured prominently at Dr. Venture's tag-sale — he and White gossiped about some of the other people attending, whom they later attempted to woo into becoming their arch-enemies. Billy and Dr. Venture also fought over a Shrink ray, and Billy criticized Venture for a redundant decal on the ray. In Escape to the House of Mummies Part II, the shrink ray caused some problems for Billy when he, White, and Dr. Venture attempted to repair it. White and Venture forced Billy to be their human guinea pig, and instead of fully shrinking him, it seemed to do one body part at a time (at first his lungs, then his head). He eventually forced them to reverse the ray to make him normal again, but it merely made a giant out of him without making his clothing bigger. Billy has shown a fondness for the high five…and is always 'left hanging'.

In Escape to the House of Mummies Part II, Billy admits that he is a virgin, and at the end of the Season 4 episode The Revenge Society it is suggested that he inadvertently loses his virginity to Sgt. Hatred. However in The Silent Partners Hatred reveals he merely cuddled with him; Billy loses his virginity in the same episode to three prostitutes whom he believed to be vampire brides.

In season 4's Handsome Ransom, Billy and Pete White try to aid Dr. Venture in rescuing Hank from the Monarch (none of the three knowing he had already been rescued by Captain Sunshine). During these events, Billy reveals that he was 35 years old after Sgt. Hatred mistakes him for a little kid. Later, in "The Revenge Society," he is kidnapped by his former teacher - now insane and calling himself "Revenge" - and forced to participate in the activities of Revenge's "team." He is left out cold in Dr. Venture's study and eventually found by Sgt. Hatred, as described above. Also in The Better Man, he becomes a member of The Order of the Triad, but this was because they didn't want to pay his steep medical fee.

Billy Quizboy

In Season 6, Pete White and Billy have achieved their dream of becoming super heroes. They now battle it out on a regular basis with their arch enemy Saint Cloud who uses his vast fortune to torment them. After a confrontation with his personal enemy Augustus St. Cloud leads to them selling their company to him which left Billy and Pete White without a home. However, luck was on their side as it turns out that St. Cloud sold their company to VenTech Tower as a result the two move to New York. After moving to New York, they become Venture's chief inventors and personal staff. During Rapacity in Blue, Billy would come to believe that Dr. Venture is the superhero Blue Morpho (really the Monarch in disguise) and would swear to keep his "secret". Billy would repeatedly drop hints of Dr. Venture's secret to the latter's confusion and annoyance.

In Season 7's Arrears in Science he finally learns the Blue Morpho is not Dr. Venture and is shocked when the real one shows up. During The Bellicose Proxy he and Pete White scramble to defend themselves after receiving a Declaration of Villainous Aggression from archnemesis Augustus St. Cloud, which ultimately results in a verbal showdown in front of the VenTech Tower where the three of them pass out from laughing gas.


Billy claims to be a boy genius, though in reality he is not a boy. He has shown much truth in his claim to be a genius as he is often shown repairing or inventing mechanical devices as well as being a self-taught neurologist and master surgeon, performing otherwise impossible feats of medical surgery. He also discovered the hidden codes in the episode ORB. He has a habit of regularly being kidnapped to perform illegal surgery for all kinds of villains and criminals. Despite this, Billy wasn't a true Doctor until the episode The Silent Partners, as he hadn't attended college and never received a PhD or Doctorate. In that episode, in exchange for performing a heart transplant on Monstroso, Billy received legitimate medical credentials from The Investors, making him legally a doctor.

He continues calling himself a "boy" genius because "nobody's really impressed with 'Master Billy Quizboy, Adult Genius.'" He took the "quizboy" moniker due to his earlier history as champion on a game show at a young age. He is also vocally a fan of Rusty Venture, having idolized the boy adventurer ever since he was a child, though this will not prevent him from ripping into Dr. Venture when the latter's flippant attitude frustrates him. Despite his longstanding friendship with Pete White, he is frequently frustrated with Pete's similarily flippant and nonchalant attitude, resulting in Billy often making passive-aggressive gestures to him that ultimately go unheaded. Billy is also rarely taken seriously by his doting Mother, who incorrectly assumes he is gay due to his close friendship to Pete.

Abilities and Skills

According to Pete White, Billy is (more like) a "neurogeneticist," and is generally more competent than his colleagues. He operated on Dean to help his testicular torsion and fitted Jonas Venture Junior with a bionic arm similar to his own in the season two premiere, Powerless in the Face of Death. He also reattached Dr. Venture's arm at the end of Victor. Echo. November. despite it being detached for some time, in The Revenge Society Billy attached Councilman 8's head onto Councilman 3's body creating a 2 headed man as well as giving Monstroso a new heart. At the very least, Billy is an exceptionally skilled surgeon despite lacking any sort of training.

In Rapacity in Blue, Billy, along with Dr. Venture, was able to create mind control gas which causes rats or people to suffer from hallucinations. The effects of the gas wear off in a day but leaves those exposed with confusion and a severe headache.

Billy's mechanical arm is complex enough to allow him to perform intricate surgery work, but by his own admission tends to get buggy after precision work. He is also able to launch the hand from his wrist, which stays attached via cable. Despite this, he cannot retract his hand automatically due to the lack of any pneumatic motor function, and any weight placed on the cable causes him extreme pain due to it being directly attached to his nervous system.

Relationships With Other Characters


Rose Whalen

Rose is his mother, first introduced in the Season 5 episode The Devil's Grip. In her youth she was the dance-themed superhero Triple Threat, fighting crime alongside her partner Jass. She calls Billy her "little water baby" and sings the lullaby "Hush, Little Baby" to him in its entirety when she wishes to soothe him.

It's explained that Billy didn't see or speak with his mom for many years, most likely due to OSI-induced amnesia on his part coupled with a misunderstanding about his friendship with Pete White. Upon reconnecting with The Action Man in Boca Raton and meeting his godson Hank Venture for the first time, Rose explains to them she believes that it is because Billy thought she may disapprove of his living with a man for so many years. When she is introduced to Pete White, she mentions that Billy had once told her that he thought he was handsome.

In All This and Gargantua-2, Billy is exasperated with his mother babying him and her relationship with Action Man. However, he is in awe at her defeating Fat Chance, asking about her moves but she excuses it as dancing.


Pete White

Billy and White are the co-founders, and sole employees, of Conjectural Technologies, which they run out of an old trailer which is also their home.

Billy like others calls Pete gay, though he is more teasing and knows the latter likes women.

As seen in Are You There, God? It's Me, Dean, it's unknown what the company actually does, but it appears as if White bosses Billy around, forcing Billy to do housework and company-related tasks while he plays video games (Billy retaliates by passive-aggressively leaving post-it notes reminding Pete of what he should do).

In The Invisible Hand of Fate, Billy regains his memory of his old life and excitedly tells a worried Pete he was in the story before Pete knocked him out. As Billy laid unconscious, it is revealed that Billy met Pete while the latter was a host for the quizboy contests. Pete had been rigging these contests in Billy's favor, at which they were eventually caught. It is revealed Pete White is responsible for most of the tragic events of Billy's life such as mistakenly entering Billy in a dog fight, thinking it was a Quiz, which resulted in Billy losing his left hand and eye. After an incident that erased Billy's memory, Billy was given back to Pete where he would remain. At the end of the episode, Billy wakes up and states he had a weird dream before realizing it was real at which point he curses Pete and those around him.

During The Silent Partners, Billy states he is through with Pete, having left him upon getting money to become a doctor.

However, he returns soon after and the two would move to New York when their company is sold to VenTech Tower.

Dr. Venture


Billy has always been a huge fan of "The Rusty Venture Show," and it was his life long dream to meet him. After meeting him however, he was substantially disappointed. Now they are considered friends, with Dr. Venture often calling on him and Pete White for favors. He and White are The Ventures' neighbors living just over the hill off the highway nearby and visiting often.

Billy even reattached Doc's arm after it got cut off in Victor. Echo. November.. Doc was grateful for the help.

During A Very Venture Halloween, where Billy dressed as Doc as a kid and they have a friendly game that Billy wins a round at.

In All This and Gargantua-2, Billy argued with Doc about accommodation. When Billy realized he couldn't help JJ, he apologized to JJ and Doc for the trouble and his brother.

In Season 6, Billy and Pete move to New York after their company is bought by Augustus St. Cloud who would sell the company to Dr. Venture who recently inherited his late brother's company. In one episode, while the under effects of his mind control gas Billy would come to believe that Dr. Venture is the superhero Blue Morpho (really the Monarch in disguise) and would swear to keep his "secret". Billy would repeatedly drop hints of Dr. Venture's supposed secret to the latter's confusion and annoyance.

In Season 7 he learns the truth and is shocked to see he was wrong about Dr. Venture being the vigilante. Afterward he goes back to his usual--still venerable--treatment of Dr. Venture.

Dean Venture

In the episode Showdown at Cremation Creek (Part II), Billy appears as Giant Boy Detective in Dean's hallucination sequence aboard The Monarch's Cocoon. Dean must hold Billy in high esteem, as Giant Boy Detective is Dean's favorite literary character.


Augustus St. Cloud

Billy has a "decades-long" rivalry with Augustus St. Cloud, as expressed by the latter. The source of their rivalry is presumably the result of St. Cloud losing to Billy on a gameshow, since in "What Color is Your Cleansuit," it was revealed that St. Cloud spent a small fortune reproducing the set of Quizboys. Their rivalry includes things like who is most proficient at trivia, and who is the bigger "fanboy" based on merchandise acquisition. Obviously having more money at his disposal, St. Cloud especially enjoys defiling precious collectibles in front of Billy, such as his Henrietta Pussycat soap mitt, and the Goldfinger outfit he had modified to fit him. At one point, St. Cloud demands Billy eat a dollar in pennies, since that's how much he sniped a collectible for in a recent bidding war with St. Cloud. Because he wanted to make his long-time feud with Billy Quizboy official, St. Cloud bribed the GOCI to let him arch Billy and Pete White. In Season 6, during one of their schedule arching Billy is forced to sell his and Pete' company to St. Cloud. When St. Cloud comes to their home to gloatingly tell them he has sold their company, Billy expresses displeasure at seeing him. However, it turns out that St. Cloud sold their company to VenTech Tower allowing Billy and Pete to work for Dr. Venture in New York.


Billy has a large head which he claims is the result of Hydrocephalus, and that this condition may be the source of his high intellect (in reality, the condition tends to have more negative effects on intelligence). In some early episodes, his head makes a sloshing sound when he moves it. He also possesses a Growth hormone deficiency, the source of his small stature. In addition, Billy has a distinctive speech impediment, giving him an odd lisp and reinforcing the perception that he is a child.

Before the origins of Billy's eye-patch and bionic arm were revealed in the episode The Invisible Hand of Fate, he once claimed the arm was a weapon, which no one believed. In the episode Victor. Echo. November., #21 and #24, The Monarch, and Hank and Dean gossip about the origins of Phantom Limb, all of which tangentially involve Billy losing his eye and/or hand. Though each of the stories is portrayed as being false, it is implied that at least some of the information in Monarch and #21's stories is true:

  • The Monarch's Story: When Billy was twelve, he invented a machine which accelerates muscle growth and tried it out on his roommate at the time, Phantom Limb. The machine malfunctioned, driving Phantom Limb insane as well as rendering his limbs invisible and giving him the power to kill by touch. In the aftermath, Limb apparently mutilated Billy out of revenge. The story is notable in that it implies Billy may well have been a boy genius in his childhood, though the Monarch could be referring to Billy being twelve facetiously. The muscle enhancer is later seen being used by Phantom Limb to accelerate the healing of Brock Samson's gunshot wound, which also supports the Monarch's account.
  • 21's Story: Billy and Limb won money on Card Sharks which they used to invent a time machine, which transported Limb's limbs and Billy's hand into the future. The results of the story, however, while humorous, (Phantom Limb's limbs and Billy's hand traveling to the future) are also false based on the fact that Phantom Limb's limbs are simply invisible, not absent.
  • Hank's Story: Phantom Limb was a renowned stage magician who accidentally transported his own limbs to the moon in a botched trick. In a fit of rage, he then sliced off Billy's arm and ate it. There is no veracity to the first part of the story, as Phantom Limb's limbs are invisible, not absent, though the part about Limb slicing off Billy's hand does apparently mirror the end of The Monarch's version, in which Phantom Limb harms Billy off-screen, perhaps depriving him of his appendage.

At the end of the same episode, when Dr. Venture asks Billy himself how he got his robotic arm, Billy flatly responds: "That's an excellent question. I have no idea." The behind-the-scenes reason for the eye-patch, according to the commentary on Tag Sale - You're It! was that Billy's character was originally designed to possess a vast number of unusual affectations, including not only a robotic limb, eye-patch, hydrocephalic head and lisp, but also "to always be in mourning for something," to wear a black armband, etc.

In the episode The Invisible Hand of Fate, it is finally revealed that Billy lost his hand and eye in a dog fight and had them replaced by O.S.I.: an artificial eye to collect data, and an artificial arm to store it; the O.S.I.'s plan was to have him spy on a college professor named Fantomas who they suspected was tied to the Guild Of Calamitous Intent. Fantomas was (as the Monarch said) building a muscle-growth accelerator, and used Billy as a lab assistant. When the machine malfunctioned, Billy's artificial eye was sucked from its socket and lodged in the machinery, causing an explosion. This incident is the reason why Billy wears an eye-patch, and the reason for Phantom Limb's powers. It also contributed to the rise of the Guild, as the O.S.I. operatives involved were reassigned as punishment for botching the mission. Billy later forgot all of this due to an experimental "brain wipe." The creators of the Venture Bros. planned to air this character information near the end of the second season, but its broadcast was delayed due to a decision to expand the season finale into a two-part cliffhanger.

Episode Appearances

Season 1

Season 2

Season 3

Season 4

Season 5

Season 6

Season 7

Christmas Songs



  • In earlier seasons, Only Billy's hand from the wrist-down was cybernetic. In later seasons, his entire forearm is shown to be cybernetic.
  • Billy admitted he was a virgin and it was implied he lost it to Hatred in ORB. However, Hatred revealed that he only cuddled Billy, meaning nothing happened.
    • Billy definitely lost his virginity to prostitutes, who he mistook for vampires.
  • Despite his medical and scientific backgrounds, Billy has never tried to address the issue of his missing eye.
  • He may be aware of Dermott Fictel's true parentage, since he was the one who gave Hank and Alchemist a tip.
  • He is an unofficial member of the Order of Triad.
  • Billy is responsible for Phantom Limb gaining his powers.
  • He is a very skilled physician and scientist, as demonstrated by his skill.
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