Possessing deeply-held convictions, heightened by this bitter personal vendetta, V fights passionately for dignity and freedom in a dystopian and fascist Britain. This takes cunning and guile, a certain fearlessness, bravado, a capacity for extremism and a touch of madness.

"He’s a very complex and ambiguous man," says Weaving. "He’s been imprisoned and tortured, mentally and physically abused. And that has created this vengeful angel, if you like. He’s an assassin, but also a very cultured and educated man who believes strongly in individual freedom."

With his entire performance taking place behind the immobile mask, leaving him without the facial expressions or eye contact that are fundamental tools for an actor, Weaving had to find other ways in which to humanize and animate V. "I loved doing mask work at drama school a long time ago," remarks Weaving, "and making V’s mask work onscreen was a great acting challenge. You need to convey a lot through voice, but there are also small, fluid movements you can use that help give the mask a life it might not otherwise have had. It was also a question of trying to work out what the mask says in different light and with various shadings."

"From the moment Hugo put the mask on, we knew it would work," says McTeigue. "He has a theatre background, which is important to the character. He also has a great physicality and a fantastic voice. He was able to make peace with the mask’s claustrophobic restraints and convey emotion through his voice and movement."

V’s use of the Guy Fawkes mask and persona functions as both practical and symbolic elements of the story. He wears the mask to hide his physical scars, and in obscuring his identity, V becomes more than just a man with a revolutionary idea – he becomes the idea itself. This underscores V’s belief that a man can be defeated, but ideas can endure and retain their power forever. V’s mask also provides contrast to the metaphorical "masks" worn by his fellow citizens, who have surrendered their individual identities and beliefs in order to assimilate and avoid persecution by the government.

"In the film, V is described as an idea rather than a person," says Natalie Portman, who stars alongside Weaving as Evey Hammond, the young woman in whom V awakens a latent activism. "One of the reasons he is so invincible is because you can kill a man, but an idea can’t be killed. So V represents truth, resistance and individualism. But his vengeance taints his political idealism."

Playing opposite an actor wearing a mask throughout the entirety of the film was challenging, but director McTeigue had no concerns with Portman’s ability to engage emotionally with the character despite his fixed disguise. "I knew she would be able to play off the mask and help make it come alive."

A highly accomplished young actress, Portman’s career already boasts roles in Star Wars: Episode I, II and III, as well as acclaimed performances in such films as Closer, Garden State and Everyone Says I Love You. Having previously worked with Portman as first assistant director on Star Wars: Episode II – Attack of the Clones, McTeigue had witnessed firsthand her incredible talent and focus. "She’s completely professional, and looks luminous," compliments the director. "But more than anything, her fearlessness and intelligence were perfect for the role."

"Evey represents the people V is trying to help," says Silver. "But while she joins V in his campaign to free the people of England, she doesn’t condone his pursuit of personal vengeance. Natalie is such a subtly expressive actress, we knew she possessed the rare ability to portray this kind of inner conflict."

Evey is orphaned at a young age after her parents are killed for daring to speak out against the repressive regime gaining a stranglehold on their country. Thrust into activism after the politically-motivated death of their son, in a sense Evey’s parents chose their political ideals over their daughter. "She’s had a very personal experience with political activism – one that resulted in her parents’ death and left her alone – so she’s just trying to live her life under the radar and stay safe," says Portman. "She lives through her fear."

Until the night that fate hurls V into Evey’s life. Patrolling the streets after the universal 11pm curfew, undercover Fingermen, the state’s secret police, catch Evey alone in a cobblestone alley, stealthily making her way to a friend’s house. With only pepper spray to defend herself, she falls victim to the ruthlessness of their warped use of judicial discretion. But before the encounter disintegrates into brutality, a mysteriously cloaked man appears, saving Evey’s dignity and her life. Unknowingly, this chance meeting sparks Evey’s political awakening.

In the face of torture and solitary confinement, Evey’s political consciousness becomes fully realized. "Through her imprisonment she learns to face her fear, and overcoming that fear is important for her own integrity," asserts Portman, who was required to shave her head on camera for a pivotal sequence in the film in which Evey’s identity is violently stripped down by her captors.

Portman was intrigued by the ideas in the story and by Evey’s transformation from an anonymous office worker to a brave and politicized heroine. "The script has really strong political and ideological overtones," she says. "And it looks at the kind of choices that must be made in order to be a political person, and how those choices affect an individual’s private life."

In preparing for her role, the actress watched The Weather Underground, a documentary about a group of young American radicals in the late 1960s and 1970s who bombed the Capitol building and broke Timothy Leary out of prison. She also read famed Israeli prime minister Menachem Begin’s autobiography, which describes his early Soviet imprisonment and subsequent leadership of Irgun, a militant Zionist group in Palestine responsible for terrorist activities intent on expelling the British from Palestine.