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The characters of The Venture Bros. are largely either re-imaginings of the characters from Jonny Quest, comic book superheroes and supervillains; or of other famous figures from popular culture. Hank (voiced by Christopher McCulloch) and Dean Venture (voiced by Michael Sinterniklaas) are the titular fraternal twin brothers of the show. Hank is the more adventurous and Dean the more timid and bookish of the two.
Dr. Thaddeus "Rusty" Venture (voiced by James Urbaniak) runs Venture Industries. Dr. Venture assumes the occupation of a "super-scientist", and certainly has the knowledge to back up these claims, but his actual competence and credentials in the field are questionable. Brock Samson (voiced by Patrick Warburton) is the muscular, hyper-masculine bodyguard to the Venture family. He is an Office of Secret Intelligence agent with a frequently used license to kill. Dr. Venture's deceased father, Dr. Jonas Venture (voiced by Paul Boocock), developed a loyal and rather emotional robot named H.E.L.P.eR. (listed in episode credits as voiced by "Soul-Bot") that accompanies and assists the Ventures.
Throughout the series, the Venture family has had various recurring antagonists. Many are current or former members of The Guild of Calamitous Intent, a group that bears resemblance to the Legion of Doom.[citation needed] The organization is run by the mysterious leader known as the Sovereign, who is revealed to be real-world singer David Bowie in episode 26. The pernicious but ineffective supervillain the Monarch (voiced by Christopher McCulloch), the masculine-voiced Doctor Girlfriend (voiced by Doc Hammer), and their numerous henchmen are some of the Venture family's primary nemeses. Baron Werner Ünderbheit (voiced by T. Ryder Smith) is a former dictator of the duchy of Ünderland and bears a grudge against Venture, whom he blames for the loss of his jaw in college, citing, "One is always supposed to look out for one's lab partner!" The season-three premiere reveals that the Monarch was responsible for the explosion, an attempt on the life of Dr. Venture. Phantom Limb (voiced by James Urbaniak) is a ruthless killer, villain insurance agent, and high-ranking Guild member; also, he is a former lover of Dr. Girlfriend's before she left him to become The Monarch's companion.
The Ventures' friends and acquaintances include expert necromancer Doctor Byron Orpheus (voiced by Steven Rattazzi) and his apathetic, teenage goth daughter Triana (voiced by Lisa Hammer), who rent out a portion of the Venture Compound; the albino computer scientist Pete White (voiced by McCulloch), a former college friend of Dr. Venture's; and hydrocephalic "boy genius" Master Billy Quizboy (voiced by Hammer). Surviving members of the original Team Venture, a group of extraordinary people assembled by Dr. Jonas Venture, have also appeared occasionally.
