Viewers of The Outlaws were left speechless tonight as a Hollywood movie star continues to appear on the series.

Superstar actor Christopher Walken stars as aging criminal Frank in Stephen Merchant’s new BBC sitcom.

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The Bristol-based series – which has already proven to be a success – focuses on a group of juvenile offenders reunited as part of a community-based recovery program.

Tonight the story continued and saw Frank find a suitcase full of money, then play with the decision to keep it or not.

Although they had already appeared in the first episode, fans continued to be amazed that movie star Christopher was on the show.

Viewers took to Twitter to share their joy at seeing their hero on the BBC series, with a tweet: “Already enjoying this #theoutlaws on @ BBCOne… Christopher Walken, wow. !!”

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While this one said: “Slow start last week, but picking up nicely, with moments of laughter followed by real tension … and fabulous Christophe Walken brings a little Hollywood magic to it all. “

Another commented: “I’ve never been a huge Stephen Merchant fan, but you have to give it to him for choosing Christopher Walken in #theoutlaws.”

Speaking about signing up for The Outlaws, Christopher told The Sun, “I’m a fan of Stephen. We met at my house and I was very impressed with him.

“It’s very good writing: you can tell, if you’ve been doing it for as long as I have.

“I’m standing in my kitchen and read the lines aloud and they were really good words.

“I’ve been to England several times in my career, not Bristol. It is a great place. It is a university town.

“I live in Connecticut, which is close to Yale University. There is a theater there where I worked several times when I was young. Bristol looks a lot like this.

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“The first time I was here there were riots, a lot of noise outside. The second time around there was also a lot of noise outside, but I think it was because of the football.

Christopher has starred in several notable films over the years, racking up 11 nominations during his illustrious career.

Born in 1943 in Queens, New York, to a family of five, like his brothers, he became a child actor in the 1950s, appearing as a feature on numerous television shows.

After his first film in 1971, Christopher became the main actor in a film, The Happiness Cage, a year later.

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In 1977 he starred as Annie Hall’s brother in Woody Allen’s Oscar-winning film Annie Hall.

A year later, he won the Oscar for Best Supporting Actor in Michael Cinimo’s 1978 film The Deer Hunter.

In the film, Christopher plays the role of an emotionally scarred Vietnam War veteran.

He is also famous for his one-stage cameos. Perhaps most notable is his scene as Captain Kloon in Quentin Tarantino’s 1994 classic Pulp Fiction.