• Karl Urban as William "Billy" Butcher ,the leader of the Boys and former SAS operative who distrusts all individuals with superpowers. He has a particular hatred towards Homelander, who he believes is responsible for the disappearance of his wife.
• Jack Quaid as Hugh "Hughie" Campbell ,a civilian member of the Boys who joins the group after his girlfriend Robin is killed by A-Train.
• Antony Starr as John / Homelander ,the extremely powerful leader of the Seven. Beneath his public image as a noble hero, he is narcissistic, sadistic, and cares little about the well-being of those he professes to protect.
• Erin Moriarty as Annie January / Starlight ,a light-emitting superhero and member of the Seven. One of the few superpowered individuals sincere in helping the public, she questions her loyalty to the Seven after learning of their true character.
• Dominique McElligott as Maggie Shaw / Queen Maeve ,a veteran member of the Seven with enhanced physical strength and durability. Although she once wanted to protect innocent lives, she has become disillusioned and suffers from burnout and post-traumatic stress disorder.
• Jessie T. Usher as Reggie Franklin / A-Train ,a speedster member of the Seven. He is determined to maintain his status as the fastest speedster, resulting in him becoming addicted to Compound V.
• Laz Alonso as Marvin T. "Mother's" Milk (MM) ,a member of the Boys responsible for organizing and planning their operations. Formerly a medic in the United States Marine Corps, he is motivated by his father working himself to death while attempting to bring Vought down.
• Chace Crawford as Kevin / The Deep ,a member of the Seven who possesses the ability to communicate with aquatic life and breathe underwater. He is looked down upon by the other members of the Seven due to his status as the group's token aquatic hero. Patton Oswalt voices his gills.
• Tomer Capon as Serge / Frenchie ,a member of the Boys and international arms trafficker skilled in munitions, ordnance, infiltration, and communications. After being coerced into joining to protect his criminal friends, he seeks redemption for his past crimes while battling Vought.
• Karen Fukuhara as Kimiko Miyashiro / The Female ,a mute member of the Boys with enhanced strength and regenerative healing. Involuntarily injected with Compound V as part of a scheme to create superpowered terrorists, she joins the Boys after they rescue her.
• Nathan Mitchell as Black Noir ,a silent member of the Seven who possesses superhuman strength and agility and conceals his physical appearance behind a dark costume.
• Elisabeth Shue as Madelyn Stillwell ,the charismatic, scheming vice-president of hero management at Vought International.
• Colby Minifie as Ashley Barrett ,a publicist for Vought International and later the company's vice-president.
• Aya Cash as Stormfront / Liberty ,the first successful Compound V subject and member of The Seven with plasma-based abilities. Native to Nazi Germany, she holds supremacist views towards minorities and individuals without superpowers.
• Simon Pegg as Hugh Campbell Sr ,Hughie's father. He cares deeply for his son, but does not believe Hughie has the confidence to stand up for himself. Pegg was the visual inspiration for Wee Hughie in the comic book series from which the series is drawn.

The Boys is set in a universe where superpowered individuals are recognized as heroes by the general public and work for the powerful corporation Vought International, which markets and monetizes them. Outside of their heroic personas, most are arrogant and corrupt. The series primarily focuses on two groups: the Seven, Vought's premier superhero team, and the eponymous Boys, vigilantes looking to bring down Vought and its corrupt superheroes.

The Boys are led by Billy Butcher, who despises all superpowered people, and the Seven are led by the narcissistic and violent Homelander. At the start of the series, the Boys are joined by Hughie Campbell after a Seven member kills his girlfriend and the Seven are joined by Annie January, a young and hopeful heroine forced to face the truth about those she admires. Other members of the Seven include the burned-out Queen Maeve, drug-addicted A-Train, insecure the Deep, the mysterious Black Noir, and supremacist Stormfront. The Boys are rounded out by tactical planner Mother's Milk, weapons specialist Frenchie, and superpowered test subject Kimiko. Overseeing the Seven is Vought executive Madelyn Stillwell, who is later succeeded by publicist Ashley Barrett.

The first season depicts the initial conflict between the Boys and the Seven, which is motivated by Butcher believing Homelander caused his wife's disappearance. While Homelander and Stillwell conspire to receive government support for superheroes, the Boys attempt to stop them by uncovering Vought's secrets. Initially unaware of each other's affiliations, Hughie and Annie muddle the conflict when they enter into a relationship, despite Butcher's distrust of her.SourceWikipedia

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